This is what I bought for my rostock. Works out to be about 10bux per motor. They are suposedly used, although I find they all worked very well. The bearings in them have 0 slop. I am happy with mine.
[
www.ebay.com]
My Personal Blog. Build blog.
[
engineerd3d.ddns.net]
Modicum V1 sold on e-bay user jaguarking11