I am making a cake (12x18 sheet pan) on the 27th. I need to know if there is anyone that can tell me a good way to transport it in a good sized box with a decent sized board that will keep from smashing the side borders. The only thing i have is the 13x19 boards and boxes that tend to smash the borders. Is there anywhere I can purchase at a store (chicago area) or online (to receive NO LATER than the 26th)? This is an important cake for me and any help is appreciated!