We sell good, original BMW, used E30 3-Series 11/1986-1991 Steering Rack units. The price is $300 plus shipping.
One option is to go remove the part from a help-yourself junkyard, but the amount of work involved and the skill level required, are not trivial. There is also a fairly sizable risk involved, because steering racks tend to not age well.
We found a non-BMW brand, refurbished, for just over $250 … plus a core charge of $250.
We found a ZF (which I believe to be the official BMW brand part) unit, rebuilt, for just over $900.
Allegedly the BMW dealer charges, wow, more than $825 for a new, original BMW part … plus a core charge of $500.
We don’t charge a core charge. Some of the other vendors I’ve researched do add on a core charge. To redeem that, you have to take or send your old part back to where you did the transaction, within a particular span of dates. This seems reasonable — yet often, this ends up being non-viable in practical reality. In such cases, the core charge ends up as simply one more cost.
It’s probably safe to say that our used units are price-competitive.