Yes, I get mine from Ebay. You want the ones listed as FAT. And you need them at least 8 inches long.
I dope the wraps with epoxy and let them harden. Then I apply a couple of coats of Spar Polyurethane.
This coating is very durable and resists UV damage. The quills are very tough themselves, but this
provides a very good protective coat. Your floats will last a long time.
Nothing can compare with the bite sensitivity of a quill float.