A belated thanks for the replies - I have been real busy for the last couple of weeks and haven't been on the forum.
After checking with Imperial and Robvon, who appear to be the only two US manufacturers, I decided to get a Roper Whitney 383 HD set of slip rolls (all rolls driven) to roll my own.
I was looking at about $2.85 - $3.15 per ring, and the shipping across the country for a barrel of 200 was a killer. It came out to about $4.50 per ring total by the time they would get here.
Thanks again for the info.