PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $262.46 |
| PSA 8 | $356.93 |
| PSA 9 | $422.61 |
| PSA 10 | $2666.56 |
| BGS 10 | $3467 |
| CGC 10 | $1600 |
| SGC 10 | $1600 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-japanese-promo/pokemon-japanese-promo-mewtwo-p-46