Came across this site last week and ordered a custom leather pocket holster for my new Cobra .38 Special Derringer:



Came in just a couple of days via Priority Mail. Very good quality leather and excellent workmanship. Fits like a glove and prints like a wallet in my pocket. Easy to draw from thanks to it's unique design. They make similar holsters for just about every popular pocket gun on their website:

http://www.pocketholsters.com/index.html

I paid $64 shipped. Not the cheapest out there, but totally worth it IMHO.