Where could one obtain a cheap kicker amp?

A cheap kicker amp, or amplifier could be purchased from any of the following websites: Kicker, Sonic Electronix, HiFi Sound Connection and Half Price Car Audio. A cheap one, either new or used, is bound to appear on eBay from time to time. This would perhaps be the cheapest of all. Lastly, one could just go to a local Radio Shack, or order from the official Radio Shack website.