The SKB pictured in the Cabela's 2007 Archery catalog that they call
the "New Parallel Limb Geometry Case" is as good as they come. If you
happen to be close to a "Sportsman's Warehouse", they also sell them.
I haven't been able to find the same case on SKB's web site though.
The Parallel one on the site is different. The one in the cataloge is:
42" x 20" x 8" and fits my Guardian and Commander really well. In their
last cataloge it's item #MW-41-8231.
Good luck with your search.