PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $128 |
| PSA 8 | $15.5 |
| PSA 9 | $142.1 |
| PSA 10 | $259.2 |
| BGS 10 | $337 |
| CGC 10 | $77.17 |
| SGC 10 | $156 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-japanese-web/pokemon-japanese-web-slowpoke-1st-edition-12