When I bought the rear sub-frame bushings for my M3 they worked out at around £50 stg for each pair of bushes.

Here is the link to the ZF, Lemforder, Sach ect online catalogue. You can cross reference OE part numbers on it to make sure you are getting the right stuff. You can then use the Manufacturer's part number when ordering in the motor factors to make sure they are getting you the right thing.

https://webcat-services.zf.com/index...2,14,1632,1614