I saw this link from slickguns. I don't know anything about the company (or the crowdfunding site), but thought I would pass along the information.
http://www.rockethub.com/31622
1 80% lower = $35 (AR15 or AR10)
1 Jig kit = $50 (AR15 or AR10)
2 80% lowers = $60 (AR15)
2 80% lowers = $65 (AR10)
The costs get lower per unit as you give more money.
This is from their site:
I hope this may help someone, or at least give another option.