PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $21.52 |
| PSA 8 | $49.99 |
| PSA 9 | $89.03 |
| PSA 10 | $240 |
| BGS 10 | $312 |
| CGC 10 | $144 |
| SGC 10 | $144 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-base-set/pokemon-base-set-rattata-1st-edition-gray-stamp-61