I am using the Galco Yaqui Slide Belt Holster for Lefties. It works with the 45, 9, 9c and 22. Nice simple leather.
FYI it is slightly generic and requires about 24 hours break-in by [per Galco instructions] wrapping the gun with three or four freezer bags and putting it in the holster and then binding it down with the two fitment screws. After that it fits like a glove.
I shoved the M&P9 in with the bags and left it for a week while I was on a business trip. Came back and it was perfect.