Cabelas has a Bushmaster for $599 for Black Friday.
You can order real AR's over the Internet and have them shipped in to one of the FFL's here for a small fee. Try looking/shopping at some of the online sites like Bud's Guns or Impact. Look them over - Armalite, Bushmaster, Colt, DPMS, S&W, all the main manufacturers are there. You can also look into Palmetto State Armory which has an excellent reputation.