What kind of power are you looking for? I have MTX amp that I paid $249 5 years ago, Blaupunkt 2150 Class T amp (paid $120 last year). Both of them can be used for subs and components. This doesn't mean I'll sell. I'd only do that if it really helps you out.
I have an old school Alpine i'd sell for 20-30 that works great. Not sure on the wattage handling. It seems like 15x2-35x2w RMS. Cosmetically, it's in fair condition.