West Marine
I was flipping through the West Marine catalog the other day and they have a ton of rollers that are sold according to boat length. The problem I noticed was that (besides being ridiculously expensive) you can't use them to furl up your headsail on the smaller models - it is either all the way out or all the way in. I think if I had the money to buy a roller furler, I'd spend it on something else like an autopilot - they're about the same price and I love mine. It's a must if you want to solo.