Since I need a new one for the Project GoaT Engine, I've looked it up:
Original p/n is 9135194.
The Usual Suspects' web sites say -
iPD sells the MTC VM375 version for $55.17 USD at present (on sale) + shipping. Note: the holes in the pulley are too small for the iPD tool, according to reports.
FCP has the Corteco version for $95.99 USD + shipping.
Skandix has OE for e93.86 + shipping.
VP Autoparts USA has them (brand not specified) for $70.30 USD + shipping.
CVI doesn't stock B230 ones (they do stock new B234 items however)