PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $20.99 |
| PSA 7 | $20 |
| PSA 8 | $25 |
| PSA 10 | $965.5 |
| BGS 10 | $1255 |
| CGC 10 | $579 |
| SGC 10 | $579 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-japanese-promo/pokemon-japanese-promo-slowpoke-adv-p-59