Like the title says. I know $75 might be a stretch for a HU that plays mp3's, but it doesn't have to be top of the line. Just the basics:
20W X 4
CD-CDR-MP3 (poss. wma)
Preout (multiple fine too)
must have face, unit, wiring harness, and cage
Decent shape cosmetically and working condition.
Don't have much to trade:
Have 1 10 MTX Road Thunder sub (single 4ohm)
1 8" JL audio w6 (has issues)
Foam surround worn off, bought kit online, replaced foam.
Sub works fine now, is not near as stiff as it used to be, but plays fine.
Also one lead came off the connector. I soldered a wire on it and wrapped it around the connector. both coils work fine, sub gets loud, gets nearly as loud as my RE 8 in a ported box. But seams to want to bottom out easier.