You are probably familiar with the normal avenues of book finding, Barnes and Noble, Borders, etc. But I just wanted you all to think about other sources.
Library book sales
Yard and tag sales
GF Guild meetings book swaps
And one many overlook, even if a member, e-BAY!
Yes , e-Bay is a great source, for example, right now there are 4 pages of GF listing, of which 80-90% are books. There are some foods there such as Montina baking mix and some brownies, and also a few bread making machines with a gluten free cycle. So don't forget to check out ebay and see how you can build up your library!