You should check out - Tactical Machining - They are located in Deland, Florida. And you may be able to get into a new one built by them for price you are looking to spend on a used one.
Give them a call and ask for Darren.
Contact Iformation:
Phone: 386.490.4464
Deland, FL
Not affiliated to them, just bought a few lowers and were great quality products.