You can pick up an Audiobahn A4125HCT amp for ~$500 on Ebay right now. That will have plenty of power to power 4 MB Quart Q-Series QSC216's. :) But I agree, $150 isn't going to get you anything worth buying.
"The 300ZX Turbo is a dance; it's a song; it's rolling, roaring automotive art. There is no color that doesn't suit it. There is no mood-lifting chemical substance it can't replace." - Automobile Magazine