Oliver's Mountain Man Bi Sit Ski

My name is Oli, and I am 12 years old. I have cerebral palsy and use a computer to talk which I control using my eyes. I need a new sit ski as I have outgrown my old one. I am trying to raise £3500 and have just completed a sponsored run around Hillsborough lake in my chair which I control by a single switch on my head. I love skiing with my friends at Kendal Snowsports and also holidays to the Alps. I control sit ski by leaning and looking, and Dad helps slow me down. I love it but need your help to buy a bigger bi-ski from the USA