What are ways I could fund raise for a wheelchair van?

I am 15 and I have a rare genetic disease called muscular dystrophy. It continually makes the muscles in different areas in my body weaker. I have used a power chair 24/7 since the 3rd grade. The only times I haven't been able to use my power chair is when I am not at home or school, because I don't have a wheelchair van to take me places. (You can't fit a power chair inside of a car/SUV.)

It's continually getting more and more uncomfortable for me to sit in my manual chair, and I'm dreading going places because of it. I also hate sitting in the house all day, but I'd rather be comfortable and bored than mad that I can't push myself where I want to go, and that I'm uncomfortable.

What are ways I could fund raise for a wheelchair accessible vehicle? Stores? Churches? How do I get people to sponsor my cause?