http://cgi.ebay.com/ebaymotors/Mercedes-window-regulator-RH-W124-300E-300TE-E320-400E_W0QQcmdZViewItemQQcategoryZ40018QQitemZ7992721885QQrdZ1

This guy has a bunch of various regulators BIN for $48.95 + shipping. Remeber to look in the buy it now items as well as auctions

http://cgi.ebay.com/ebaymotors/WINDOW-REGULATOR-mercedes-benz-E300D-95-front-auto-LH_W0QQcmdZViewItemQQcategoryZ33706QQitemZ7988649311QQrdZ1