Hello! I'll be going to Tianjin on october. Where can I buy good sneakers like Nike?

Oh, there are a lot of such shoe stores where you can buy nike shoes. Here are some branch stores in that city.
Nike Factory Store, located at Lingbin Road, Nankai District.
Located No. 184 Binjiang Road.
Located at No. 302 Nanjing Road.
No. 190 Heping Road.
You can have a try in these places. As for the cost for the shoes, it varies widely. A pair of regular Nike shoes may cost of CNY500 - 600 around.

Thank you Alan! :)