I'm fairly new here myself - but welcome aboard! :-) I just got a 627 Pro-Series, so I've spent a lot of time searching for holsters and moonclip accessories myself recently.

Here are a couple holsters made specifically for your gun...

Product: RH Tan Leather Thumb Break Scabbard For S&W PC M627 5"

Product: RH Tan Leather Dual Angle Holster For PC M627 5"

And here are a couple options that I like for moonclip holders...

I have these and really like them...
California Competition Works Moon Clip Belt Holder for 8 Shot Full Moon Clips Blue Aluminum Center Steel Silver - MidwayUSA

I dont have this one, but I'm working on building my own using Kydex...
North Mountain Moon Clip Holder, Single Post

If you dont have a moonclip tool yet, I highly recommend this one...
http://mooncliptool.com/

Good luck!