Electric Scooter / Electric Moped?

I wanted to buy an electric scooter or electric moped that could go atleast 20 mph, but not from the x-treme brand. If its an electric moped, i want it to be able to travel at a distance of atleast 20 miles. Priced $500 or less please.
Update: where cn i buy one..... a store...or an online store... not ebay
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