Why is yak milk powder sold in Qinghai tourist destination so cheap?

Yak milk comes from Qinghai. According to the query of Guangming. com. By July 26th, 2023, there were 6 million yaks in Qinghai Province, accounting for one third of the total number of yaks in the world, ranking first in the country. The milk source of yak comes from Qinghai. Excluding middlemen to earn the difference, yak milk powder sold in tourist areas will be cheaper.