I found a seller on ebay who has the Japanese style bags for storing CD/Double CD /DVD case games. http://stores.ebay.com/uniquepacking Prices aren't too bad. I find these are perfect for protecting games from the white hazing you get on the edges from shuffling cases in a bookshelf or box.
I LOVE those... Got some included with my import J-Music some time ago. They are so convenient, and my CD cases never suffered to boot. The cure for anal-retentive conditionists like us!
So long as I can get replacement cases and noone is the wiser.... Although the DC style cases have been getting harder to find as of late.