As mentioned by F30lolz, Bringatrailer is probably your best bet if it is in really great condition. You could also check out posting it on the R3VLimited.com forum. That site is dedicated to the E30 chassis and has a wealth of info on those cars.
Also, pics!
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Current: 2011 E90 M3, 1992 E30 325ic
Retired: 1986 E30 325e, 1991 E30 318i, 1991 E30 325ic, 1998 E39 528i, 2002 E46 325xiT, 2003 E39 530i, 2005 E46 325xiT, 2008 E90 335i