Marstar(site sponsor) might be a good place to start. Most western holsters will fit easily....though a bit loosely, on a 2" belt. If there is too much movement when drawing(usually the holster wants to ride up with the revolver), it is an easy matter to tighten up the fit to accommodate. Rivets, thongs, blocks, Chicago screws, etc. Another alternative is to make your own. Not hard to do. There are any number of tutorials on you tube, showing the process.
If money is not a problem, and you want your money to stay in Canada... you can always get one custom-made. in which case Working Cowboy Leather (Chatham, ON), is a good choice. Will build to suit. Also, Last Best West (Calgary), might be another source, right in your back yard.