These guys are great. I've been to at least a dozen gun stores in the Phoenix area and most are staffed by arrogant neanders who don't have any desire to help. At Merchant, the owner Aaron and his staff are friendly, helpful, and knowledgeable. Their prices are fair too. As far as inventory, they have more Sigs than I've seen anywhere, and tons of tactical rifles. The space is on the small side, but they must have 100 pistols on display as well as 30 or more rifles. Merchant also has a huge selection of suppressors and they are a class III dealer. I asked recently if they were going to be getting any of a new high end limited release Sig target pistol and Aaron told me that he had TEN on order.
Just last week I stopped at a store near Baseline and McClintock in Tempe and they had 4, yes 4 pistols in stock. That smacks of a store with financial issues.
I can't recommend them highly enough