Is it that much cheaper in China. A one gallon paint is quiet heavy already not to say ten cans of them. your shipping is not gonna be cheap. You can use EMS to ship them here, you will need the proper MSDS sheet for them if you can import them. You can call Border Services first or you can contact one of the brokerage company, there are many of them check the Chinese newspapers. After all the shipping, brokerage and taxes your ten pails of paint better be dirt cheap from China!
Let's say even the paint is free, yes I agree that the needed shipping cost might be more expensive than getting paint here in Vancouver, and the document and custom thing is another troublesome issue. Plus, is the paint (for interior and/or exterior) be suitable for Vancouver weather climate? How if you need more and for future touch up, you have to ship it again from China? Sounds too much trouble and risky to me.
No offense to OP but why buy paint from GuangZhou? (other than that it's possibly cheeper than buying locally?)
Besides: what sort of quality are they? are they lead-free? Alkyd paint or solvent-based enamel?
also: are you talking about Acrylic latex? Enamel? Polyurathane? Some paint are more "toxic" then other (such as automotive-grade 2-part polyurathanes) that without certain hazardous material permits or similar (for importation), I don't see you being able to get them in by following the protocol.