Flip top bottle boxes

[matt.]

I use quite a few flip top bottles for my beer and have found that the boxes the bottles come in are not tall enough for when the flip tops are closed.

I have plastic boxes that are the correct height, 11" - 27 cm but they are quite expensive.
Anyone any idea where cardboard boxes of the correct height - with bottle dividers - can by bought?

Or another solution.

Many thanks folks