Polish Poly subframe bush? Under $45 a corner in 80A 90A? About $150 ish/set for 90A. The bushings appear to be 2 peace like Prothane
Last I checked shipping about $30
I guess its true - StongFlex, offer other stuff cheap too,including differential bushings:
http://www.strongflex.eu/en/34-bmw-e82-04