I buy them at one of the local cake supply stores. . .
I bought 100, 10x10x6 boxes for $25.00 I think, maybe it was less.
If you have a cake supply store close by, then buy as you need them.
Or if you know you're going to be using A LOT of a particular size, then
spend the $ & buy the pack, it's more economical in the long run. . .
I try to have a variety of boxes and cake boards handy so I don't have to go to the cake supply store too often
I know, can you believe I try to stay away???? Shocking isn't it? Well, the reason is, I'd buy the whole freaking store every time I go!!!!!!!!!!
I need to win the lottery. . .