If you are willing to wait a month or so, I can get you the Alpine MRD-M500 and two Type-R SWR-1021D 10" dual 2ohm woofers for cheap. The reason for the dual 2ohms is, you would wire them in series to get a 4ohm sub each, and parallel them to the amp to get a 2ohm load on the amp. Send me an IM or a PM