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Please build a Microcenter in Arizona. You would destroy the competition. Frys electronics sucks and Best Buy rarely has any parts for building a PC. Tempe, Chandler or Scottsdale would be great locations to consider. Tempe Market place or Mills Mall would be great places to have one.
https://www.microcenter.com/site/stores/phoenix.aspx Computer Store in Phoenix, AZ - Micro Center
Thinking about building a new PC and I like to check out towers in person. Also, the sales people were very knowledgeable and fantastic
Fry's Electronics is your best bet for sure, although they are slowly dying out
Reiterating what several people have said, Fry's Electronics is your best bet. They are closer to a box store so often better selection than a microcenter but no where near the deals in my experience. There is one in LA if you are itching for a trip.