Scarce rather than rare. They are really, really overbuilt for that caliber. That being said they are a pleasure to shoot and a GREAT way to introduce new shooters to the world of pistols when combined with a 38/357 version of the same gun.
Start with CB caps, then move to LR, then shift to 38 target loads, standard loads or +P, then 1 or 2 magnums through the pipe if the shooter seems ready.
I am in the camp that it is great as a 6 shot, but would be the bee's knees if it were 7 or 8.