Originally saw these units from LMS:
4th Axis Rotary Table for CNC - LittleMachineShop.com

Then i searched ebay, and found similar units:
CNC Router Rotational Rotary Axis A Axis 4th Axis 3 Jaw and Tailstock | eBay

Anyone have one? Not looking at using this for production. Would like to use it for more small one off jobs in aluminum and plastic, and honestly just to learn and get comfortable with programming for a 4th axis. The belt drive should be adequate for what i have planned. I see it has a ratio of 1:8. With a little bit of re-engineering an additional pulley system could be added easily to multiply the ratio.