I know that the cheapest (by that I mean most affordable) AR's out there would most likely be those done by Olympic Arms. Can't totally vouch for quality, though...
Get a Bushmaster or RRA. If it were my choice, I'd go with a RRA LAR-15 A4 midlength.
Get a Bushmaster or RRA. If it were my choice, I'd go with a RRA LAR-15 A4 midlength.