Are you looking for a stripped lower or a complete lower?
If complete, then I have a New Frontier Armory forged aluminum lower with a Palmetto State LPK, JP Enterprise Fire Control Kit (https://www.jprifles.com/buy.php?item=JPFC-1) with the yellow/yellow springs (3.5 lb. pull), JP anti-walk pins an A2 buttstock, tube and buffer and either an Ergo or Hogue grip (your choice).
I will let it go for $275 and can meet you in Schulenburg.
Not familiar with NF Armory. Who makes New Frontier's lowers?
I've got a Stag 2A lower with the milspec pistolgrip & trigger group, and a carbine buffer & collapsible 4U486 stock.
It's unused! Was gonna use it myself, but fell on harder & harder times and never got to use it for anything.