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It's a little awkward as they are 1U in height (not supported by modulargrid), but they exist...

Here's some cases that support the tiles:

http://erthenvar.com/store/lunchbox

http://www.ebay.com/itm/251306429860

You can also build your own:

http://erthenvar.com/store/eurodiy/casehardware

EDITED Aug 3rd 2013, 21:16