You may remember that I was unable to sign up as a seller with Amazon. Well, this past weekend I was messing around in my Amazon account (actually I was buying toilet paper and kitty litter - did you know you really can buy just about anything on Amazon?) and I saw this link, "Your Seller Account." My seller account? I didn't know I had one. I found a book I had that is out of print, so not available on the main site, and in fact not available from any used book seller, either, and listed it. And it just sold.
It's nearly as exciting as the first time I sold something on eBay.