PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $20.38 |
| PSA 7 | $90 |
| PSA 8 | $147.54 |
| PSA 9 | $436.99 |
| PSA 10 | $5344.23 |
| BGS 10 | $6948 |
| CGC 10 | $3207 |
| SGC 10 | $3207 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-base-set/pokemon-base-set-mewtwo-1999-2000-10