I saw a wave blaster the other day and it was very sketchy and kind of a wild ride.

Can those be found around used for a good project ski or should I stick to a 650 to fix up...I am looking for a project ski for my son and I to do together.

Used...what can I expect to pay for a good used one? Either a Waveblaster or a 650...if not one of these models, then what would you recommend?