if you make it to green apple, make sure to check out the locked case of rare books at the end of the art section. it's at the end of the left wall as you walk into the store. they usually unlock it for me and let me browse alone. they have several rare photography books in there.
there is also the regular photography section upstairs, which has a ton of used and new photo books, but it is usually messy and a little confusing to sort through.
bob