Fastest way and least cost to ship one mobility scooter wt: 80 kgm from Shanghai China to USA

Well, first of all, I'm afraid that the max limitation is 30kg. Thus you need to send the package separately in the following way: 30kg, 30kg and 20kg.
For surface mail, the cost is CNY 665 for 30kg and CNY 465 for 20kg.
For air mail, the cost is CNY 2,900 for 30kg and CNY 1,900 for 20kg.