Galaxy Audio PA5x140 - the loudest little dynamo I've ever seen. It fits on a mic stand, has two channels, global EQ, compression, line out, speaker out. It's so versitile. I use it a hundred ways. You get about 90watts as a stand alone, and 144 with an external speaker load. (8ohms).
All this for under $300 US ! Keep it on the floor of the trunk .... it'll come in handy alot !