I am pretty sure I have officially done business with all of the auction houses in the valley. I have to say depending on what you are looking for they run a fair auction.
You can either go on the west side which I think is EJ's and find some lower end fun finds or go to Scottsdale and find higher end amazing itemsl. I always feel welcome and have never felt like I over paid or was treated unfairly etc. I love going....check it out. Heads up westside is no AC, Scottsdale does and cookies...yum.