help buy an eye gaze communication aid

Hi My name is Natasha, i am 15, love love doing exciting things like sailing, but I also have cerebral palsy with affects all my muscles and speech. so i need help with differnt equipment . I sail a boat by sip and puff and this is being written by mum as I cant use my hands to type. I have tried a new computer system and communication aid that tracks my pupils, and so my eyes are the compter mouse, its soo cool! I could use the computer with no help from anyone!! So I am saving to buy one, if you could help me anyway that would be Fab! thanks, Tasha x