Just as in the case of any product category, the prices of electric scooters for adults vary a lot. Starting from under $100 they can go as high as a few thousand dollars. The prices usually depend on the brand, the specifics such as speed and distance, overall quality and materials used, extra features, battery quality, and software involved.
However, when we talk about costs, it is not only the initial price we should consider. How charging the unit will affect the electricity bill is another thing to keep in mind. Moreover, since you might need to look for replacements of various parts after a while, their cost is also important.