Many pple ask me on Carrym, where to buy them... but unfortunately Diginexx doesnt sell them. I dont know this guy but this is a dual speed version...for people interested...
http://www.togoparts.com/marketplace/ad_details.php?cid=10&aid=260867&page_id=1&done=list_ads.php%3Fcid%3D10%26page_id%3D1