Crutches

Does anyone know where I can buy/rent some crutches? I have sprained my knee and I need to stay off my knee. In the long term I might need a knee support, like a DonJoy knee brace. Has anyone had to go through this in HCMC?

Thanks

There are so many surgical supply shops on Tran Hung Dao street, Q.1

Is there a specific store you recommend? I need to buy one for my sprained ankle that is inexpensive yet good quality to go around the city this week.