Cheapest priced copy (Marvel Super Heroes Commander): $0.35 at Card Kingdom, near mint, their price list as of .
Thwip! 
Instant · Common · Marvel's Spider-Man · #20
Target creature gets +2/+2 and gains flying until end of turn. If it's a Spider, you gain 2 life.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel Super Heroes Commander | 780 | Common | $0.35 | $0.49 |
| Marvel's Spider-Man | 20 | Common | $0.35 | $0.49 |