2-10" Clarion Pro Subs SRM2504 (400 watts max ea)- $200 for the pair includes custom box built for E36 trunks.
Rockford Fosgate Punch Amp 100a2, in the box- $100
Full set of OEM U.S. Ambers (Not Clears) - $150 obo
All this stuff came out of my 97 M3. I just bought the subs and amps a few months ago, but never installed them.
All prices include 2nd day shipping within the U.S.