There is a Mariner Roller Furler listed on Ebay if you're interested.
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
Also, found this photo on the web.
Not sure how well this thing will work. Probably more practical on a smaller boat. I believe someone said that it tends to roll up the bottom half of the sail fairly well, but the top half not so well.
I guess if you can buy it cheap enough it's worth a try.