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Or you can use a smaller resonator with a regular size box (unless you already have a resonator and need a box to fit).
Here is a link to Old Lowe's handmade resonators. http://smokehouseguitars.com/blognewsroll/?cat=38
I have one of these boxes and It works great. Biggest I could find here is 13 x 9" x 3". It does have a lip around the top and bottom edges.
Heavier wood than a cigar box though. http://stores.ebay.com/designcraft-industries?_trksid=p4340.l2563 john