The Voigtlander Bessa L case works just ducky. It's made to accomodate the finders that the L requires - the top of the case has a high ridge to close over the finder. Ebay always has a couple for sale in the $15-25 range and Gandy sells them as well.
I haven't gotten a chance to actually use it yet, but I recently acquired an L with a 25/4 and the above-mentioned case. The camera is actually a neat little piece of work and a screaming bargain especially as a small, light second body to keep a wide on. I'm not sure I'm going to keep the rig, but I'm anxious to get it out tomorrow for some leaf peeping.