There is an outlet, in the amazing Wukesong camera mall in Beijing, for Ilford products (as well as many others). IIRC, they advertise in View Camera magazine.

I bought my Shen Hao 4x5 in that mall so there definitely is a place to go for this stuff.

Not sure what Shanghai, Era or other Chinese manufacturers offer for the more unusual film offerings -- be very curious to know for anyone who can post that info?