Also located in the Scottsdale rare book district, next to the Antiquarian Shop and about a block from Charles Parkhurst Rare Books.
Compared to the other two shops, this one seems more focused on the west, exploration, science, religion and philosophy. The stock also seems more obviously the sum of individuals' previous collections, so if you and one of those former collectors have common interests, you're in luck.
Most of the books are also for sale online, but lower priced items are often not. It might be possible to find a good deal if you look reasonably hard.