If the electronics are in very good condition, you can often sell them for a good price on eBay, and then you get cash, which you can spend at ANY bookstore
. It's a bit more work, perhaps, but cash is good!
Over the last few weeks, in the run-up to the holidays, I was amazed at how much I got for some old mp3 players and an old XM radio set-up. I take really good care of my electronics, so they were all in great shape, but still I was very pleasantly surprised by how much they sold for...