PJ's Pets (
PJs Pets - Store Locator ) in Pickering, Ontario carries zoozones (or at least zoozone knock offs). They have both the large/small version. They are sort of off on their own, not near the other small animal cages so you might have to ask or look around. PJ's has other locations in Ontario, and eastern Canada so it might be worth checking them as well.
At least in Ontario, our Ikea's stock expedits and detolfs too so DIY is an option. Lee Valley Tools has just about every type of weird hardware for such conversions too.