There are 9 Spider-Man 2 Prowler Stashes scattered around New York that give Rare Tech and XP, plus a final reward for completion.
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All Prowler Stash Locations and Solutions - Marvel's Spider-Man 2 Guide - IGN
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Marvel's Spider-Man 2: All Prowler Stash Locations and Solutions
Marvel's Spider-Man 2: All Prowler Stash Locations and Solutions