My LBS knows it can't carry everything for everyone and has recommended another LBS or an online shop where I can find whatever it is I'm looking for. Because of their willingness to help me find what I need, and their honesty about why they can't carry it (small shop, trying to keep inventory/overhead down) I will Always go to them first. Even if I don't end up buying from them. They also know - they'll be the first place I come to if I ever buy a new non-custom bike, and they take care of all my bikes rather I purchased it from them or not. As a trade-off, they take care of me!
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"