The above links are great resources, but my line of thinking was leaning more toward a list of shops/FFL's that are
vouched for by the local community (in this case, the members of this forum). A generic online list of dealers is a good start, but I'm confident we can muster up a more comprehensive and helpful resource than that...
Here, I'll start:
Scottsdale
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Bear Arms. Scottsdale Rd south of Shea Blvd. Wide selection of new and used firearms, usually has plenty of bulk ammo in stock. $35 transfers, +$15 to expedite (as of JAN-2020).
Gilbert
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Quentin Defense. McQueen Rd north of Guadalupe Rd. Manufacturer as well as FFL. Loads of AR parts, billet goodness galore. $20 transfers (as of JAN-2020).
Casa Grande
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On Sight Shooting. Florence Blvd west of Mission Pkwy. Largest shop in Casa Grande, good selection of new firearms, accessories, and suppressors. $25 transfers with CCW, $30 without. $50/$60 transfers if from GrabAGun, Bud's Guns, CheaperThanDirt, or Palmetto State Armory, with/without CCW, respectively (as of JAN-2020).