A Wave is a great "learner" boat; but if he's looking for CHEAP, that kind of rules out a Wave. They hold their value too well. Old H16's are a dime a dozen.
That Auquacat video just shows the same white-haired guy going back and forth in front of the camera, broad reach to broad reach, over and over. Doesn't look like it could go upwind very well; and with that A frame, you couldn't let the sail out enough to go dead downwind either.