I was looking for S&W 422 magazines, that was the only site with them in stock. I emailed them and got a reply that they were closed until 8/30 so I thought I would do some checking to see if anyone else had bought from them.
In the mean time there was a release of 422 mags (also fit the Model 41) and a bunch of places I had back in stock notification requests in with have them. I ordered from Midway USA.
Texasgunparts.com looks like it might be a good source for hard to find stuff.
To be honest, if the guy had not been on vaction I probably would have gone ahead and ordered the mags from him. The ones I ordered from Midway should be delivered by Friday.