I have sold my E30 and I'm trying to get this stuff out the garage. So, pay for shipping plus a little extra and you can have it:
Spare radiator (used): $50 plus shipping
Spare control arms (used) w/ center/tie rod ball joints (needs to be pressed in but will include all the joints (brand new): $75 plus shipping for everything
Overhead computer: $15 plus shipping
I think that is everything, but I'll double check.