Palmetto State has some deals on right now...
- $269 for blem'd carbine upper
- $89 for BCG w/ charging handle
- $79 for 'classic' build kit
- $59 for stripped lower
Of course, factor in shipping and FFL transfer, and you're over $500. You'll probably want a rear sight like the MBUS, which will add another $50. A cheap-o UTG would be half that.
If you go polymer...
- $109 New Frontier w/ LPK and buffer tube/stock
- $89 for PSA BCG and CH
- $269 for PSA upper
Not that you should cheap out on a homestead defense rifle, but there are some pretty good deals to be had these days.