Searching for A Knee Scooter

A friend was looking for a knee scooter for sale at the mall yesterday when I bumped into her. She was asking me if I know a store which she can buy one. She badly need it for her mom who had an accident a few days ago. But I don't know a store here in our place that he can buy that equipment. I just told him that I will help him look on the internet. So here I am now searching the web for some knee scooter. Where do I find one? Any suggestion?