This is cool to see so many Canadians on this website! Since I usually only make cakes for family and friends (and friends of family, and friends of friends....!) I usually get my boxes from the grocery store. Food Basics always puts their boxes right out front for people to use. Every time I'm in there I look through and pick boxes that are a good size. It's just the bottoms of course, no lids. Then I cut my foamboard (which I buy at Michael's when it's on sale) to fit perfectly inside the box - and cover the board with shelf paper (mac tac, whatever you want to call it). Once the cake is in the box, I cover the box with clear basket wrap or even just saran wrap. I just hate paying $3 or more for a box....I guess if I was doing this more "professionally" I would buy boxes....Last time I bought a box (because the cake was for one of my kid's teacher) the side flap hit the writing on my cake board and I had to do a couple of the words over! By the way, not sure if I'm allowed to promote another cake decorating website on here - but there is a Canadian version of CC at cakescanada.com !!