If you were talking stringed instruments then it it would definitely be worth your while to sell them on ebay. I've sold a couple of dozen guitars on ebay. Even shipped 1 to England and 1 to Japan.

With electronics you're probably better off to just give them to someone that you think will use them and appreciate them. The resale value is next to nothing in most cases.
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Bob
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http://soundcloud.com/bobcflatpicke/music-in-the-mountains