Welcome to the forum. That's a nice looking G21. There is a vendor forum that has members that make and sell holsters. FoxX Holsters comes to mind.
Ahh I see you found our new site. We are in the process of migrating everything from the DefensiveHolsters.com site to the DefensiveConcealment.com site. You can still visit DefensiveHolsters but any purchase links will now take you to the page you listed.Odds are I'll end up going with this if I can't find something more concealable http://www.defensiveconcealment.com/custom-kydex-holster-streamlight-tlr-1-light-combo/ Thanks for the help in advance!