I ordered a new camera for my Beijing Olympic trip. However, I need a few spare batteries. If I order today in the USA, they may or may not arrive in time. I would like to just buy them in China the afternoon I arrive or the next morning. I've noticed a lot of the batteries coming from HK, and I know if I was in HK, it would not be a problem to find them. However, I can't really figure out the ease of getting them in Beijing. FWIW, the battery is LP-E5, for the Canon XSi.

Is this possible?
Will I be able to get savings over what they are here ($10/each=70 RMB)?
Lastly--Any suggestions on where to find them?