If this still feels unclear, that’s not your fault
Fantastic Four #28 is a perfect example of why comic buying decisions feel harder than
they should.
Some grades quietly compound while others stall.
Price can look reasonable and still be misleading.
And what feels “stable” on a price guide often hides risk that only shows up later.
I struggled with this for years — even on iconic books like this one.
The issue wasn’t access to more data.
It was misreading the signals that actually matter when deciding if — and how — to buy.
I documented the framework I now use to make these calls — the same thinking behind Underval’s
fair-value logic.
Join hundreds of collectors already using Underval!
Frequently Asked Questions
What is Underval?
Underval is a free comic-book analytics and listings platform. We estimate fair value by grade, display
annual growth rate, show recent sales and sales history, and surface active listings.
Where do your sales come from?
We aggregate public online sales from major marketplaces and auctions such as eBay and Heritage Auctions,
then normalize and de-duplicate them by issue and grade.
How do you calculate “Estimated Worth (Fair Value)?”
Fair value blends recent realized sales with longer-term trends, outlier filtering, and grade-level
liquidity. It’s an informational estimate, not an offer.
How often are values updated?
Values update as new sales appear. Each grade’s “Updated on” date reflects the most recent sale we’ve
matched for that grade.
Which grades do you cover?
We track Universal CGC-graded copies across common scale points (e.g., 0.5–10). Availability varies by
issue and observed market activity.
Do you offer investment advice?
No. Underval provides data and estimates for research purposes only. Always do your own diligence before
buying or selling.
Estimated worth (Fair Value) is $27600
based on 3 sales over ~10 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 9.8 value,
CGC 9.8 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 9.6 worth in 2026?
Estimated worth (Fair Value) is $9600
based on 6 sales over ~7 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 9.6 value,
CGC 9.6 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 9.4 worth in 2026?
Estimated worth (Fair Value) is $2547
based on 20 sales over ~14 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 9.4 value,
CGC 9.4 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 9.2 worth in 2026?
Estimated worth (Fair Value) is $1920
based on 16 sales over ~23 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 9.2 value,
CGC 9.2 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 9.0 worth in 2026?
Estimated worth (Fair Value) is $1112
based on 30 sales over ~18 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 9.0 value,
CGC 9.0 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 8.5 worth in 2026?
Estimated worth (Fair Value) is $832
based on 30 sales over ~14 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 8.5 value,
CGC 8.5 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 8.0 worth in 2026?
Estimated worth (Fair Value) is $578
based on 50 sales over ~22 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 8.0 value,
CGC 8.0 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 7.5 worth in 2026?
Estimated worth (Fair Value) is $490
based on 43 sales over ~22 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 7.5 value,
CGC 7.5 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 7.0 worth in 2026?
Estimated worth (Fair Value) is $409
based on 55 sales over ~22 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 7.0 value,
CGC 7.0 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 6.5 worth in 2026?
Estimated worth (Fair Value) is $326
based on 66 sales over ~20 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 6.5 value,
CGC 6.5 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 6.0 worth in 2026?
Estimated worth (Fair Value) is $238
based on 52 sales over ~14 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 6.0 value,
CGC 6.0 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 5.5 worth in 2026?
Estimated worth (Fair Value) is $234
based on 41 sales over ~22 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 5.5 value,
CGC 5.5 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 5.0 worth in 2026?
Estimated worth (Fair Value) is $225
based on 42 sales over ~11 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 5.0 value,
CGC 5.0 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 4.5 worth in 2026?
Estimated worth (Fair Value) is $156
based on 56 sales over ~13 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 4.5 value,
CGC 4.5 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 4.0 worth in 2026?
Estimated worth (Fair Value) is $172
based on 42 sales over ~12 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 4.0 value,
CGC 4.0 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 3.5 worth in 2026?
Estimated worth (Fair Value) is $200
based on 25 sales over ~9 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 3.5 value,
CGC 3.5 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 3.0 worth in 2026?
Estimated worth (Fair Value) is $90
based on 17 sales over ~11 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 3.0 value,
CGC 3.0 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 2.5 worth in 2026?
Estimated worth (Fair Value) is $105
based on 14 sales over ~7 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 2.5 value,
CGC 2.5 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 2.0 worth in 2026?
Estimated worth (Fair Value) is $80
based on 2 sales over ~3 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 2.0 value,
CGC 2.0 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 1.8 worth in 2026?
Estimated worth (Fair Value) is $120
based on 1 sales over ~1 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 1.8 value,
CGC 1.8 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 1.0 worth in 2026?
Estimated worth (Fair Value) is $160
based on 2 sales over ~1 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 1.0 value,
CGC 1.0 price, Fantastic Four #28 worth.
What is Fantastic Four #28 CGC 0.5 worth in 2026?
Estimated worth (Fair Value) is $175
based on 2 sales over ~7 years
.
Informational estimate, not an offer.
Updated on
based on the last sale.
Also searched as: Fantastic Four #28 CGC 0.5 value,
CGC 0.5 price, Fantastic Four #28 worth.
Legal Disclaimer
Underval is a platform designed to provide information about the
potential value of comic books based on data analysis. We do not provide investment advice, and any information
provided on our platform is for informational purposes only. While we strive to offer accurate and reliable
data,
the decision to purchase any comic book should be based on your own research and judgment. Underval does not
guarantee the accuracy, completeness, or reliability of any information provided, and we shall not be held
liable
for any actions taken based on the content available on our platform. By using Underval, you acknowledge and
agree
to these terms.