Whether you buy motorbike Hanoi or HoChiMinh, you are going to experience pretty much the same price range.
This trip was taken on two Honda Win's 100cc motorbikes sale, but there are others out there. If you go to Travel Swop which I have linked for you, and browse the bikes for sale, you'll get an idea of types and prices available. I used this and other sites (listed below) to get an idea of what to buy and where.
Travel Swop Motorbike for sale, Minks, Honda win, Novol, Dream and many accommodation...
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