A non-intuitive alternative is a fishing reel case. There are dozens of different designs, many accommodating 2 to 8 reels. Search google images for examples.
High class fishermen are as fussy about their reels as we are about or lenses.
Sorry! I see this has already been suggested.
As Chris said, if you can do a bit of woodworking they are easy to make. An alternative to the kerf is to glue narrow strips to the sides - like little drawer rails. There are also a lot of custom wooden box makers on the web, some of them quite reasonable. Have a dozen made, sell eleven to pay for yours.
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