How much does it cost for Han people living in Xinjiang? ...

This is the same as learning other languages. If you really want to learn Uighur, I suggest you don't go to Urumqi. You can go to Kashgar and Hotan in southern Xinjiang, where the language environment is stronger. Many Uighurs do business in the street, forcing you to learn, otherwise you can't communicate. When I was a child, I grew up there, and I could generally communicate with the environment. The Uighur language environment in Urumqi is not good, all Uighurs speak Chinese, while in southern Xinjiang, all Han people speak Uighur.