Toddler mobility rider

My Grandson is 3 1/2 years old. He was diagnosed shortly after birth with Infantile Pompe Disease. This is a rare genetic disease that effects the way he breaks down glycogen which intern effects his muscles. The Firefly Scoot will give him the ability to have more mobility and to be able to go about normal activities that other toddlers are able to do. This however can be a bit pricey so we are asking for your help