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stores can buy boards but dont really expect to get a high price...well... the surfshop i go to when i'm on a vacation does buy second hand surfs, and afters sells them
i know cause i bought an old one....anyways
as for ebay, idk...
yeah you can sell a board. most surf shops have an exchange program or something. try surf schools, they almost always take used boards.
selling a board on eBay works out well too but paying for the shipping and packaging is a bitch.