The 442 Pro Moon Clip is a best kept secret. The only place I have seen one listed is at Bud's.
As OldCop said it is a great compromise between Size, Weight, and Fire Power.
I carry mine in a Lobo Model 1 Pancake at 4 O'Clock.
If I did it over I might have went with the Enhanced Pancake, I have about 8 of them.
Lobo Gun Leather - Home
TK is the Source for extra Factory Moon Clips.
You can also load with HKS and Safariland Comp I Speedloaders.
You can also use the Tuff Products 38 Speed Strips to reload with. Get the 7 shot version, and load it with 5. The 2 empty spaces gives you a place to grip the Speed Strip.
Tuff Products
I carry my Moon Clip Reloads on the belt in a SAM "Shoot A Moon" spring Steel J Frame 5 Shot Moon Clip Carrier .
http://www.demooner.com/
I carry Speer 135 Grain Short Barrel HP +P ammo.
If you are going to carry the 442 I recommend getting an LCR 22 or a 43C which are J Frame size 22 Revolvers. After you get the 22 try and wear it out firing it. This is the easiest way to get deadly with your 442. I have the LCR 22 myself, and love it.
Bob