off the shelf doesn't exist
I've never heard of a sail loft having pre-made sails for purchase. Most will have some kind of database of sail measurements, so when you call and order sails they look up the numbers and cut to those specifications.I agree with the posts suggesting a sub 100% jib for your conditions. To find a sail, look in your local phone book, look in sailing magazines, or look online for sail lofts or sail makers and call a few of them for quotes. As a warning, they aren't cheap!