Get on PSA's email distribution. You will get 2 or 3 emails a day with different offers. Often they are pretty good if it is what you want.
I saw this sale the other day after buying another $40 stripped lower. I just figured these wouldn't sell so well when the prices come back up. I figure well known name brand uppers would be better. However, if all the name brand rifles are $1200, this might still net you some profit. The potential resale value later of these super cheap AR's has been a something I have been pondering for a while.
They also have 22 LR and 22 Mag for sale quite often also. I have stocked up on some 22 Mag for my PMR30 from them.