Just a note, GameStop doesn't really carry much of Gamesharks/Action Replays much anymore. Best Buy carries the occasional Action Replay, and EB Games carries a little of both Gamesharks and Action Replays. I don't exactly know about Electronics Boutique, seeing that I've never even been to one before. Your best bet would be just to order off of a website, such as ebay or gameshark.com.
[EDIT] Okay, sorry I'm so stupid, but I just now realized that Electronics Boutique is EB Games. That was stupid.