I'm using a 4-channel Pioneer. Lotsa power to fuel my puny stock speakers and player (280 Watts peak), very low distortion, brick-house construction, and a bridgeable 2/3/4-channel capability. It also features 4-channels speaker level inputs and a selectable crossover that makes installation very easy.

I bought the amp new two years ago for $175 USD, so a fair asking price would probably be $100 USD. I even have the original box, woot

FYI, also, I'm the original owner of both the player and the amp.