OK, I actually stumbled onto this looking for a place to stay in CAN while the Expo is in town.
Go to:
http://www.hojo.com and book a room for Apr 14 or 15 and it comes up to around 29RMB a night.
I haven't tried many dates as those are the ones I'm looking for.
Good luck... I have no idea whether it will be honored.
I have one confirmed already but not sure if I will keep.