Jet's Adaptive Bike

Jet is 3 years old and was injured at birth, leaving him with cerebral palsy.  He has been going to therapy since he was two weeks old and now also goes to preschool and receives therapy there as well.  His PT recently said she thought an adaptive bike would be great for Jet.  This is an expensive piece of equipment that is not covered by insurance.  We'll be so appreciative of any help!  Thank you in advance!