They had one at my school shop–people still waterskied back then–but if you could build your own with a large bandsaw and a gluelam. That’s pretty much all the one I used consisted of. We used some large C-clamps to force the wood together. Harbor Freight has great deals on clamps, but in a pinch, you could jack up the front-end of a pickup truck and set one of the front wheels on a home-made wood-press and achieve the same results. Also cutting your own would give you better control over rocker, kick-tail etc.

Of course another method is to hit garage sales and thrift shops, and cut down an old wooden water-ski, but where’s the fun in that?