I have written in the past about ABC Books by Ann. This is a website which discusses and reviews living books, including out of print gems. Ann also sells wonderful used living books at her eBay store. Ann publishes a newsletter that is free for the asking, which is published on the web and which you can print off on your home computer. Scroll down on this page to find the button to click to join her newsletter notification Yahoo Group!.
Ann asked me to write an article for an upcoming newsletter. I just put the finishing touches on it and sent it to her through cyberspace. I wrote about a nearby town's transfer station which has a shed full of used books which are free for the taking.