So really, it seems Canada is no different from the US. Zhu Zhu Pets are available in Canada, but they are just so popular that they can't stay in the stores. Therefore, my answer to the question above is that same that I give to people in the US:
Your best option to buy a Zhu Zhu Pets Hamster before Christmas is to buy them online (but obviously not from Toys R Us or Walmart, who don't have any!). So what's the best option? I think it's Amazon:
There are Zhu Zhu Pets available right now on Amazon.
Yes, they do cost more than list price (and they seem to be going up as Christmas gets closer), but they are in stock and you can buy them right now and have them in a couple of days. That's got to be better than running around and wasting your time at shops that don't have any.
I think the reality is that if you do want to buy some Zhu Zhu Pets before Christmas, you'll have to pay over the odds. It's either that or forget Zhu Zhu Pets and find something else for your kids.
