Be aware that although Baoshan is classed as a prefecture level city, unlike other cities of the same classification (like Kunming) it is not an urban area. As such it cannot be compared to a tier 2-3 city. That is not necessarily a bad thing.
Baoshan has one county level city (think of something like tier 6), a district, and 3 counties. Total population 2.5m, total area about 20 000 sqkm.

Full fat is better, and give a thicker yogurt. Commercial low fat yogurts are set with rennet.

The other thing you could try is heat it to almost boiling (90 deg) first as this breaks down the protein, and avoids stringy protein strands. Then let it cool to below 45 degrees (luke warm) before adding the culture. If it is too hot it will kill the bacteria in the culture. Temperatures are not critical, you don't need a thermometer, but it helps.

Thx.

@Alpage. If when you pass you ask them for a mingpian (business card) or a flyer, your wife could perhaps enquirer further with a phone call, in slow time.

The cost of living in Kunming is expensive, some things more expensive than even Shanghai. Eating out, like for like is and example.
Greek yogurt is expensive, as is cottage cheese, in comparison with EU and especially the US; where dairy is cheaper.
You can make your own Greek yogurt, I have, an flavor it with jam if you want that style of fruit flavor. There is a recent thread on making yogurt on here if you search.
My favorite snack, which is seasonal, is the candied whole kumquats.