Not sure what size you're looking for, but Avon CR6ZZ is still available in 15 inch. They seem to be a favourite for track use or hard driving.
Did you also
check out the thread I started back in 2011 about 15 inch tire choices? Ultimately I chose the Cooper Cobras for my SPF.
The Goodyear Eagle GTIIs are no longer available in 15 inch. Not that this is a loss IMO.