PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $597.92 |
| PSA 7 | $1000 |
| PSA 8 | $1077.5 |
| PSA 9 | $1501.17 |
| PSA 10 | $5400 |
| BGS 10 | $7020 |
| CGC 10 | $314 |
| SGC 10 | $3240 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-japanese-promo/pokemon-japanese-promo-mewtwo-game-boy-150