Talk to Arek from 8Legs Racing (ScotcH on the boards here). He's local and can get OEM/performance stuff.
Otherwise, I've had good success with www.bimmerspecialist.ca
- they're in BC so shipping to your door is relatively cheap and completely hastle free.
1992 BMW 325i (CHUMPCAR #296 - build in progress)
1992 3.0L M52 325i (ex-daily driver - track car only)
2002 330Ci (ex-daily driver - sold!)
Check out my e36 track car build