The one I use is
https://www.scootarama.com/index.aspx
I have used them for the past 5 years. I am renting from Friday to Monday & the scooter gets turned in Tuesday morning. I am paying for 4 days.
They will charge your credit card at the time of your reservation. But if you cancel you will get a total refund.
I also asked for & got a $10.00 discount.
Hope that info is helpful..
Deb