I have a 5HP18 trans taking up space in my garage. I got it as part of a complete drop out from 1995 530 touring via a bimmerforum member.
I can't remember the mileage on it, but the shop that removed it said the car drove fine before it was removed.
$150 obo + shipping for the trans, cooler lines, and torque converter. I believe the total shipping weight would be under 200lbs (yea . . . it's heavy).