You can buy back from other players and the price is usually lower because the kite is like a vehicle or any other commodity every year so they often sell old models to buy new ones so this is the chance to own kites that are still delicious and with low prices.
You can find these in centers where you learn and play kites. Or in Mui Ne there is a large facebook group of kite surfers joining them who often post their used equipment up there.
Or you can also buy it on ebay. There are many people around the world selling old kites on ebay. You can choose one then ship to Vietnam. Usually about 30-45 days the kite will return to Vietnam. If you don’t know how to buy please contact me. I will help.
If you are having difficulty purchasing equipment for this subject please contact me. I will help.