car audio are very cheap now days,,, examples:
alpine type-S 6.5 inch coax, $44 (better than you go to crap stores for those no name brand, pyle primid, koss, whatever)
JL audio component $88
clarion basic mp3 deck $48
alpine deck with USB input and mp3 cd, $118
MB quart 120Wx2 2 channel, $130
kicker 650W mono, WOW $140
2 12" kicker comp WITH a semi-fancy PORTED BOX $199
some prices from the local electronic stores.... canadian funds