Question about Navee S65

This is probably due to dynamic pricing, where prices go up and down. However, according to information, the model does not have road approval for Germany, Austria or Switzerland, so I would not buy it.

This model from Xiaomi is a better deal, and you can also drive it on public roads in Switzerland.

Xiaomi Mi 4 Pro (20 km/h, 1 x 350 W, 55 km)

This one is even more powerful, but a bit more expensive, but also allowed in Switzerland:

Xiaomi 4 Ultra (20 km/h, 1 x 500 W, 70 km)