Estate and yard sales seem to be the ticket. One advantage is you can ride your bike to the yard sales. Come back and pick up your purchases later. But don't despair; you're in a better buying area than I am.
I've managed to find a couple of decent deals on eBay in my short sniping career. I've heard that in the winter, the deals get even better.
It is a feast or famine cycle. My bike sizes seem to be completely bereft of anything interesting at the moment. I cruise over to my son-in-law's sizing and whammo! cool bikes galore! If I could only get him to commit one way or the other. Screw it. I may just buy him a bike and fix it up for Christmas. Can't stand to let these bikes go unbid upon.