I was JUST about to ask this same question (where to buy equipment) except that I've decided to build my own. I've found some links on directions to build one (even found one that is specific to my model of bar fridge) and there's plenty of places to buy conversion kits online but it'd be nice to see the kits in person or know that you can get some of the optional accessories locally and not have to order form the states.
If you want a premade one, the only Canadian place I found one was
Costco for $799 (there's a used one on kijiji right now as well). I've read that this model (Danby) works just fine though it takes a couple of minor modifications (easy and inexpensive apparently) to get more optimal performance.
Anyway, if you're interested, message me and I can share some of the links on this stuff.
Anyone else, if you can pass along any recommendations on where to buy keg equipment, let me/us know.