What type/size tubs are you needing? Sterilite tubs are usually available at Target stores or Big Lots, if you have either up in your neck of the woods. Iris tubs you can get on-line from:

http://www.visionproducts.us/htm7/tubs.html

or

http://www.reptiletubs.com/

I've dealt with Vision Products directly and they're pretty good about e-mailing back if you have questions. The shipping costs to ship tubs are a pain (about a third the price of the tub, each) and I'm not sure what, if any, extra expenses you might incur shipping them over the border if you elect to. There are quite a few people from Canada on this site, so maybe they can give you some ideas if that doesn't help. Good luck!