To keep the project within your price range a donor scooter would be needed that you could add new electronics onto. You could check on Craigslist or at local thrift stores to see if they have any electric scooters that do not run which could be used as a donor.
Once a suitable donor scooter has been found then we have a kit that would work to power the scooter and is within your price range minus the shipping cost. It is our KIT-102 and here is a link to it: http://www.electricscooterparts.com/electric-scooter-kit-102.html
Please let us know if you have any questions.
Thank you so much!
I know this isn't a issue, but I have a to build an electric scooter for a science project. I don't really need it to meet any specifications or standards, just that it has to have a top speed of 15-20 mph. I would like to stay in the $150-200 price range. Thank you for your time.