PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $1.42 |
| PSA 7 | $5.5 |
| PSA 9 | $23.99 |
| PSA 10 | $49 |
| BGS 10 | $64 |
| CGC 10 | $16.22 |
| SGC 10 | $29 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-fire-red-%26-leaf-green/pokemon-fire-red-%26-leaf-green-gastly-63