Just an FYI, the best prices I have found on Storm Lake conversion and regular match replacement barrels is from Optics Planet. They are also a advertiser here, which helps support this website !
This weekend they have 10% off on orders of 50.00 or more.
I just ordered a 5" barrel for my 9mm Pro for 105.00 shipped !
I have used the conversion barrels before (M&P 40 to 9MM), and they seem to be of high quality, seemed to shot better than the stock S&W barrel.
Helpful hint, if you don't find the barrel you are looking for on the Optics Planet website, go to Storm Lakes website, get the Storm Lake number of the barrel you want, then do a search at Optics Planet website, and that will help. That's how I found my Pro barrel.