Looking for used sails is like looking for a good used motor or a used car.
Sails are the power house of a sailboat.
It is a bit of a treasure hunt. Looking for that set “only used a couple of times on Sunday to show the neighbors how to raise and lower on the mast”. Then of course “they were stored in an environmentally controlled space, the cloth is like new!”
But of course if it’s just about taking the boat out on gentle days to get out on the water and enjoy the experience sails of any type can accomplish this and bring joy to the owner.