I'm getting a starter and alternator from an E30 M3 (starter is lighter, alternator is 90A) from this guy Steve who runs:

Eagle Auto Electric in Northridge, CA (sells on ebay as eagleautoelectric)
18246 Parthenia
Northridge, CA
(818) 400-4941

Pickup Only: $60 each, $50 with core, based on a conversation with him 10 minutes ago.

I'm sure he can give you a discount on shipping if you call him directly vs purchasing on ebay.

His Ebay prices are:
Starter: $75 + $20 shipping
Alt: $64 + $19 shipping

No affiliation, for your info only.