Prof. Oak's Research
Illustrated by Ken Sugimori · EX series
Raw Market Value
$4.70
range $0.99 – $7.50
via TCGPlayer
Top graded value
$171.59
PSA 9
from real sold listings
15 recent sales tracked (180d).
Price History
Daily average sale price from eBay sold listings.
180d change
-$3.84 (-64.1%)
7D30D90D180D
Graded Prices
Verified prices across 2 grading services.
PSA
| Grade | Type | Low | Mid | High | Market |
|---|---|---|---|---|---|
| PSA 10 | reverseHolofoil | $73.00 | $73.00 | $73.00 | $73.00 |
| PSA 9 | normal | $171.59 | $171.59 | $171.59 | $171.59 |
| PSA 8 | reverseHolofoil | $10.50 | $10.50 | $10.50 | $10.50 |
| PSA 7 | normal | $29.99 | $74.50 | $119.00 | $83.70 |
| PSA 6 | reverseHolofoil | $51.00 | $51.00 | $51.00 | $51.00 |
CGC
| Grade | Type | Low | Mid | High | Market |
|---|---|---|---|---|---|
| CGC 10 | normal | $164.00 | $164.00 | $164.00 | $164.00 |
| CGC 10 | reverseHolofoil | $74.99 | $74.99 | $74.99 | $74.99 |
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Recent Sales onebay
Real sold listings, most recent first.
- Aug 6, 2026$2.15
- May 20, 2026$2.19
- May 12, 2026$8.00
Final sold amounts in USD. Outbound links open the original eBay listing.