Stripped lower? I would call every LGS in the phone book to see what's local and how much. Online you have to compete with everyone, locally you just might trip over something in stock.
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