wtb: 4 channel amp that does min 240x2@4ohm under $80

need a 4 channel that will bridge to do 240x2 going in a friends budget system to power a set of comps and a single 12. the cheaper the better, ideally would like to spend around $50.

so far this is the choice: New MB Quart ONX4 60 480 Watts Onyx 4 Channel Class AB Power Car Amplifier Amp 806576216995 | eBay

if anyone has an old amp lying around cheap that will do the power let me know. or if you know of a cheaper off brand amplifier that will put out the same power let me know. thanks.