Quoted from sethbenjamin:The HF slip roller that comes up on their website retails for about $400; others on a google search climb quickly to over $1,000.
However, Grizzly has this 12" model - certainly adequate to the task of creating ball guides - for $110. Still maybe a bit rich if you're not using it on numerous high-end restorations, but I would consider buying one if I needed it more than twice.
http://www.grizzly.com/products/12-Slip-Roll/T10727?utm_campaign=zPage&utm_source=grizzly.com
What guage steel are guides usually? The DE ones I have here are 16AWG