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Many LFS will take fish rather than see them disposed of. Many big box stores can't take them, so don't bother asking. Find a little local store. Or, try Craigslist or a local club, maybe?
Yeah tons of people want guppies for sure. Tetras to. My LFS takes fish in trade and will also take them off your hands if you just want to get rid of them. Otherwise as stated above I see postings on craigslist all the time.