Well I never bought an AR but I have bought a couple of guns from Sportsman's Warehouse in Reno and they are great to deal with and there prices while a little high are not too bad. Their selection of guns is also good. I was in there yesterday and they a bunch of ARs and variants. Don't know the prices though but it's fun looking anyway.
Also there's Silver State guns north of SW on Kietzke. They have a nice selection too but aren't nearly as friendly especially if they tag you as a looker only.
Maybe Jim Zumbo knows....