I have several cakes I have been making for people recently that I am just unable to locate cake boxes for. The largest box I can locate to buy is a 12x12x5, minus $28 wedding cake boxes. Most of my fondant birthday theme cakes are all 8 inches tall. Is there anywhere you can buy 12x12x10 in boxes?
Uline has corrugated boxes in whatever size you want, but you have to order 25 of the same size. So if you have a size that would work for most of your cakes, they have pretty good prices. They have 12 x 12 x 10 right now on sale .... 69 cents each x 25 boxes plus shipping.
Hope that helps !