Midwayusa.com has DPMS lower part kits for $60 incase anyone is looking. Aimsurplus.com has Spike's LPKs for $63.60 too.
On another note, cheaperthandirt.com is run by a bunch of assholes. 1000 rounds of 62 grain 5.56 for $999.99? Lol yeah right. Oh, and they're selling 30 round mags for $100 each.
They just lost a customer.
Not putting miles on your Ferrari is like not f*cking your girlfriend so she'll be more desirable to her next boyfriend.