If you're really having trouble finding a used set, and if you have the cash, you could always buy a boat that comes with a set, then flip the boat and keep the Cat Trax. This takes cash and cajones (you don't want to get stuck with the boat)...
This works best with a boat like a Hobie Wave, you can usually turn them around very quickly. During the start of sailing season, they don't last on CL for very long.
Mike
I think the wave only has a 7' beam so those wheels wont work on most beach cats ... make sure you get wheels that fit your beam.. or you will have to add weight, expense (and a new and exciting way to bleed when you get your hand pinched by the extension).
