Larry - why not make your own?!
My suggested ideal is to make, test and prove a nice set of sails out of something meltable - like umbrella Nylon (there is a LOT of sail material being thrown away this week) cutting with a hot soldering iron both cuts and seals the edge perfectly (I also lay little reinforcing corners in the corners and they get cut out and welded into place in the same process) Make holes with same iron.
THEN bring out the sea island cotton and make a beautiful set (or encourage a sewing expert to do so). I have about 10 sheets of draughting linen with the size washed out - brilliant, but I am still using up old polycotton shirts, etc. You can still hot-cut poly cotton up to about 50% cotton as long as you de-hair the cotton strands which stick out of the seam - the polyester melts and seals the cut perfectly.
andrew