You can take an egg carton for a dozen eggs, cut off the top, place it inside one of the plastic boxes the pieces come in (it fits perfectly) and you have a cheap and quick way to comparmentalize your pieces. It took a few months to get all the ones we needed based on our egg eating rate. :)
We use two for the U.S. (including the Chinese pieces) and two for England. We use two more to hold the roundels, industrial complexes, ports, airbases, ect.