There are a number of mass production options - the original jump ringer
http://www.riogrande.com/MemberArea/...xt=jump+ringer or pepe jump ringer (available from Sutton Tools)
http://tinyurl.com/6bx78kt - both of these require a foredom. Or you can get a koil kutter from Dave Arens (email only, replace (at) with @) gemstonesetc(at)gainbroadband.com, which can be used with a foredom, dremel or proxxon, and is thus far more affordable.
However, none of these are particularly cheap, and would be pretty hard to justify unless you're looking at tens of thousands of rings, rather than hundreds. You certainly wouldn't save any money against buying them in.
I still think the best cut comes from using a jewellers saw with a fine blade (as Dennis says, 6/0 blades will do the job well and are easy to source). Given that you still have to spend the time making the coils in the first place, it's really not that much slower by the time you've set everything up. If you haven't already got a Knew Concept sawframe, this might be a more versatile, and far less costly investment?
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