There are two wholesale tea markets here, one north and one south. The most convenient one if you live in the center of Kunming is the north one. Here's the name and address for taxi purposes.
It's near 二环北路 and the intersection of 金卖路。
I usually ride bus#25, but several others go there, depending on your starting point. (Check Baidu Maps.)
But you don't need to go to a wholesale market for Hibiscus tea, which isn't really even tea after all. Any Walmart store will have it as well as many of the small hole-in-the wall tea shops. Most carry a few flower teas and herbal teas (albeit not a large selection.)
Hibiscus tea is 芙蓉茶/fúróng chá, in case you want to write it out.
This year I got one of the new 10-year visas as well as a new passport (USA.) Took it to the entry/exit bureau 昆明市公安局出入境接待大厅 on Tuodong Road across from Kunming Museum this morning to register it. 地址：拓东路118号。
The main officer on duty told me it was not necessary. Since I had already registered my new passport and visa information at my local Paichusuo 李树头派出所 within 24 hours of arrival, nothing else needed to be done.
He explained that even though my new visa has a duration of each stay of 60 days, it could be extended to 90 days if I brought in my paperwork one week in advance of my "leave-by" date.
I was not sure whether this would cancel the visa or not, as "extensions" sometimes do. He said it wouldn't.
Our conversation was in Chinese, and none of the new regulations were available in writing, so I could have parts of it wrong.