They pop up every so often. Consonantly check Ebay, use
www.searchtempest.com and search for Seadoo HX and click on every HX link. Sometimes they will pop up on a ski still, but perhaps the seller would remove it and sell it to you. They're not cheap, usually around the $300 range. Give yourself some time to get used to riding it. I'm 6'2" and 230+ LBS and I side board on my HX. Meaning I put the throttle side of the bars towards the sky, just about pin the throttle and let the ski pull me up and I toss my leg over the seat. As far as balance, that takes time and practice. In no wake zones I just put my gut against the bar pad. Congrats on the skis, they're a blast!