Recent builds:
$300 Bushmaster 14.5" M4 barrel assembly
$105 Lauer LMT lower
$ 87 WOA triggerless LPK with Ergo grip and Magpul trigger guard
$148 LMT two stage trigger
$180 LMT bolt/carrier and Badger tac latch charging handle
$ 10 Tac bolt catch
$ 32 KNS pins
$200 Colt A2 upper receiver
$469 Aimpoint H-1 Micro red dot
$ 68 Arms #2 mount
$ 51 CAR stock w/buttpad
$1650:
$347 CMMG 20" pencil barrel w/triangular handguards and three prong FH
$ 44 WOA triggerless LPK
$ 36 A1 stock
$ 9 A1 grip
$180 NoDak Spud XM16E1 lower
$ 53 A1 Bolt catch and selector
$ 10 Flat delta ring
$ 10 Small rectangle port door
$130 Slick side A1 upper
$148 LMT two stage trigger
$117 XM Grey anodizing
$140 Bravo Company bolt/carrier
$1224:
I hadn't actually added them up before this. I'm not even going to tally up the Colt pencil barrel flattop I put together a couple of months ago.
ETA - I'll echo the chorus' refrain that building an AR is, for me anyway, all about building the rifle I'm after, and not at all about saving money.