Looks like D-Way has some competition from Craft Supply.
http://youtu.be/urM-5P8_t4g
The video points out that you can use them without removing your grinder guards (wheel is 1" wide instead of 1 1/2", not sure how this is a good thing) and that you can side grind with it. Looks like it only comes in one grit, "170/200 Grit (ASTME)". Price is $196 but that includes the bushing, so it is about the same price as the D-Way wheels.