PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $17.99 |
| PSA 8 | $30 |
| PSA 9 | $45.33 |
| PSA 10 | $133.34 |
| BGS 10 | $173 |
| CGC 10 | $80 |
| SGC 10 | $80 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-promo/pokemon-promo-slowpoke-sm-p-183