We got an electric scooter for our son just a few months after he turned 7 for the same reasons. A stroller was just too babyish for him at his age. He loves the scooter and this year just started using it at school for the long distance he had to walk from the bus drop off to his class. It's really great for going anywhere that requires him to walk a lot where as before it was a stuggle. He has the Elite Go Go traveler. I have a picture of him on it on "My Page". It cost $1200 and was paid for by our MDA funds. We choose this one because it was one of the smallest ones made.
Sam gets his scooter today. It's also a GOGO. We did have a special pediatric seat made for him. I haven't seen it yet, so can't give too many comments on it, but I'll be sure to post pictures. We started with going through the MDA. They will give you $2000 towards a durable medical purchase every 3 years. I believe our total price with the special seat brought us to around $2600. Although we ended up not using the MDA funds because our insurance paid for the whole thing. Now, in most cases, it's not recommended to have your insurance pay, but we have some special circumstances that makes it OK...ie. a fabulous employer who is self insured and pays for anything Sam needs. The vendor we used was the one through the MDA. They're out of network with our insurance, but we still got it covered as in-network at 100%.
Anyhow...long story short, contact your local MDA office. First see if they have one in their loaner closet. If not, they can get a PO sent to their vendor for you. You'll also need to get a prescription for it from your doc.
Our vendor had it made for him. I think he went straight to Pride to have it made. It was the first time they've ever done one. I'll take pictures of ours for you when I get home today.