Stripped lower $95 + $5 tax at my local friendly dealer (Got 2, a matched pair)
Complete A2 upper with bolt and handle (16 inch, chromed, threaded, bayo lug, etc NO-Ban) $470 shipped from the internet (found them here, ordered via website)
Lower parts $60 shipped
6 pos buttstock $69 shipped
30 rd magazine $30 at local gun show (+ 2 more at $18 over the net)
Total $729 for all NEW parts, upper and lower RRA.
I could have saved $12 on the mag, $60 for non chromed barrel (A2 or flattop), and $20 for a conventional stock, so it could have cost me $637, again for a NEW rifle.
I have yet to build it, I am waiting on the 9mm upper, mag block and hammer to build them both at the same time, one .223 and one 9mm. Got 500 rounds of each, and I am gonna have some priceless fun down at the range.