Ribbon cable wrapped in a jacket source

Hi:
I'm looking for a place to buy about 20 feet of ribbon
cable wrapped in a jacket (several different conductor
counts) that is similar to any multi-conductor cable
(ie. round). I know this stuff exists, but I can't find
it at Digi-key, etc. I seem to recall someone out there
talking about a supplier in the past, but a quick search
in the archives didn't yield anything. Whatever the
case, I don't want to buy 500 feet of this stuff....
only small quantities.

Thanks,
Alan