PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $5.99 |
| PSA 7 | $14.99 |
| PSA 8 | $26.65 |
| PSA 9 | $50.41 |
| PSA 10 | $227.38 |
| BGS 10 | $296 |
| CGC 10 | $136 |
| SGC 10 | $136 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-japanese-ex-battle-boost/pokemon-japanese-ex-battle-boost-mewtwo-ex-1st-edition-45