Headhunter,

I think all the Prindles are boardless or centerboard models, here's a few for sale, mostly Prindle 16's though.
Prindles for Sale

If your friend can go less than 18 ft, then the Hobie 16 is a good choice, unless he's "hobiephobic" <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />
Here's half a dozen for sale
Hobie 16's For Sale