They don't have their prices listed. Does anyone? I call these "Stealth Products". Like so many other motion control specialists they don't list prices and want you to play phone/email tag with their sales staff before you find anything out. They said in their brochure it costs more than a rack system but less than a ball screw. Whatever that means.
Here is a brochure they gave me:
Roller Pinion Brochure, PDF - Adobe Acrobat Format
Revised:
The Linear Distance Per Revolution of the thing is 6.3" for the smallest model - RPS16. That is about twice the length of a regular pinion gear, assuming you chose the smallest regular pinion. This just means you have some more stepping-down to do.