From what I can tell, the 41s trickle out of S&W to the distributors, who give them to dealers. Like anything, I think the distributors give first dibs to the bigger dealers.
My LGS couldn't get one forever so I went to Buds Guns website, created an account, clicked on the model I wanted and used the option to tell me when it gets in stock. Three weeks later I got an email that it was in stock and I logged on and bought it. Otherwise, a dealer occassionally has a new one on GunBroker. These are the fastest options IMHO.