Stumbled on a nice deal on on a local trading site - Radway Green SS109 62gr green tip, British surplus 1000 rnds for $275. Works great and the guy was only selling it because it was tearing up his steel plates.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek