Buy a used car in Bangkok and then to sell one in the same p

[azarov]

Hallo!
I am going to Thailand for 1 year. The main reason is studying of my children. And I want to buy a used car in order to drive of my children in a school and back.
I would like to know where can I buy a used car in Bangkok and then to sell one in the same place in one year with payment on the spot (I don't mean trade in.)? 
I heard about Toyota Sure, maybe anybody can tell me  the similar shops in Bangkok.

Thanks in advance.

[azarov]

Thanks a lot for your help.