Years ago, they were the go-to place in the Auburn area for used guns, and not so much a pawn shop, although they DID do pawn back then. About 75% of their business was used guns when they were a hot concern. And the prices were flat-out great. If you wanted a cheap gun, you went to Cascade.
These days, business always seems slow and there are far more pawned items for sale than guns. As far as ammo and supplies, chances are you WON'T find what you need there, and anything black powder is a zero. It's too bad they fell from being a people-friendly gun shop with hot deals to the rather lame business they have going today. If you are desperate for a few boxes of 22 long rifle or any really common ammo, you might get lucky, but it will probably be a wasted trip.