Here is my small contribution (as I remember) of AR15 prices before the panic:
$550-700: DPMS, Double-Star, Olympic, Smith and Wesson M&P Sport, etc
$700-900: Spikes Tactical, Bushmaster, Smith and Wesson M&P, Wyndham Weaponry, Core15, TROY, etc.
$900-1100: Sig M400, Colt 6920, BCM, etc.
$1100 and up: Noveske, Daniel Defense, LMT, LWRC etc.
These are the price ranges that I derived while I was shopping around quite a bit before the panic because I was building a couple of AR's , and was comparing the prices between buying a complete AR or building one.