Cheapest priced copy (Marvel's Spider-Man): $0.35 at Card Kingdom, near mint, their price list as of .
Kapow! 
Sorcery · Common · Marvel's Spider-Man · #103
Put a +1/+1 counter on target creature you control. It fights target creature an opponent controls. (Each deals damage equal to its power to the other.)
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1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel's Spider-Man | 103 | Common | $0.35 | $0.49 |