Looking for stores to visit for quality used books and bargain books in Knoxville, TN
 

I will be visiting Knoxville, TN over Memorial Day weekend.
Is anyone out there familiar with the book stores in the area?
I am looking for any of the following:

out of print 18th and 19th century military history
Quality art books at bargain prices
Bargain children's books
Bargain unabridged audio books (they make commuting a little more
tolerable)

Thanks for any help