Randy, check out palmettostatearmory.com
They have a PTAC complete 308 lower for $180. You can get deals on the PSA uppers for around 300 and the BCG for 160 or so. Not sure about the PTAC lower, but I don't think it can be too horrible. The PSA lower is about 50 more.
I'd probably go that route. I have a few PSA lowers and nothing but positive things to say.