Nothing wrong with picking up used books here and there. I have a good relationship with the owners and workers at a used book store that is somewhat close to me. They're great places to find out of print discoveries at a good price.
After your last post I looked up McKay and noticed there is one about 2 hours from me in Manassas, VA. I'm not sure if it's the same chain? It seems like it's similar. Either way, I'm seriously considering taking a drive one weekend. One of the indie stores here in Richmond has a great (but small compared to McKay) used section, but I need a little bit more variety. Thanks for sharing all of your tips!
Shannon, if it's the same chain it would be worth the drive. Here's the link to the website, although it looks like they're only in Tennessee: http://www.mckaybooks.com/ You can also see the pictures they have that show how big they are. I am such a huge fan!