a cheaper way is to play with a deck of cards. just for jumps tho.
first card - rotation and ski direction
Aces wild - round up to the nearest doable rotation. ie 2- 360, 8 - 900. The color of the suit will determine your ski direction. say red - forward, black - switch. you could even mix it up if your mad pro, by deeming the 4 suits reg, unnatty, sw, sw unnatty.
second card - grab.
Just write down 13 basic grabs and give them coinciding cards.
he made it damn clear it wasn't his idea, just brought the idea to skiing. it's already in skateboarding, blading, and snowboarding, so why not continue it on?