As far as I know, nobody has actually gotten to the point of selling stackable, plastic caging in Canada (though a few places have ordered in Visions and the like, they still cost a pretty penny), there have been a few people working on prototypes and talking about it and whatnot over the past couple years. Nothing surfaced as of yet though.
J&D Terrariums makes a <a href="http://www.ssnakess.com/photopost/showgallery.php?cat=998&stype=2&si=jd_terrariums">variety</a> of custom enclosures that may suffice?
I spent a few years searching for a way to get affordable equivalents, or make my own plastic caging, and eventually found out the best way to go was to build my own out of wood and seal em up with epoxy.