They do where I live. Not the sturdiest boxes, but they'll do in a pinch.
My michael's sell wilton boxes. Not sure on all the sizes they sell =/
I have Michael's to be more expensive than my local cake store. They are also not as sturdy, nor do they always have them. I would call before going there.
All of the Walmarts around me sell them too. They don't have as many sizes, but I am pretty sure they sell the size you are looking for. It's the Wilton boxes that Michael's sells. They are in the cake decorating section within the party section.
I prefer the boxes at Walmart to the ones at Michaels but they do not have the selection that Michaels has. The ones at Walmart are sturdier and seem to "go together" and close better. Also, if you have a Party City in your area, they have a decent selection of boxes and boards.
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