There are no walk-in RC Jet stores in China, HK is the only city that sells foam jets or EDF fiberglass (partially fiber) airplanes in retail stores or pick-up at the warehouse.
I assume you are looking for the bigger higher quality type of jets. Well, the only way to get one perhaps is to call Feibao, Jet legend, Flyeagle jets and see if they have the particular jet in stock (gel coated, don't think they have painted in stock) and see if you can pick 1 up.
They'll be happy to sell you one.
Jet legend is in Guangzhou (next to the old airport), owner is a nice guy, can speak some english.
Feibao and Flyeaglejet are in Zhuhai
Btw, Skymaster is in Donguang, Guangdong but is far away from the other cities mentioned (it's closer to shenzhen)
Here In beijing there are a few shops that you could order a jet, but basically they will get it from one of these factories or some that I did not mention.
There are many RC jet factories right now in Guangdong, but not famous for there own jets, like FB, JL,FEJ or SkyM., mainly OEM for foreign companies or just not many types of jets manufactured (Jet-teng)
Hope this helped. If more info needed, email: firstname.lastname@example.org
All the best.