A friend of mine had a C&R for a while and he got discounts from all kinds of places including a few companies that sold knives, holsters, etc. He made a nice piece of change buying gear at the reduced prices and selling it (since the BATF doesn't care about holsters and belts).
Do a search for C&R, there's a site/forum out there somewhere that's devoted to C&R holders...you might find some good info.