Do you live near an used book store? Take your old paperbacks and hardbacks there. Trade them for in-store credit, or with Half Price Books, take the money and run.
I've done book signings at used book stores, and I love it! Most used book stores are locally owned and operated. The atmosphere is warm and comfortable, and often the hostess sets out goodies and drinks for the authors and customers. Better yet, the owners will often take the authors' books and sell them on commission.
(Note! Let's say you have a few paperbacks with not-so-pretty covers. Go ahead and give them to the UBS. They can still offer them in their Buy-1-Get-Something-From-This-Bin-Free box!)
I'm giving a shout-out to Pam over at Boomerang Books in League City, Texas, and Jennifer at Books Ink in Portland, Texas.
You girls ROCK! :D