I don't think JCWhitney ship to canada, otherwise I'd use them
www.driverfx.ca or any keystone dealer (Crappy Tire). I get mine from Crappy Tire or Tool Tyme in Whitby, they have SS, mild steel, aluminum from a pile of different manufactuers and they are reasonable price. Hedman, vibrant, hooker are a few of the brands, cheap for canada anyways, I pay around $27 for a big 180 degree 2.5" mild steel mandrel bend. When you are done, degrease it and etch it and paint it with exhaust paint, it will hold up pretty good, especially if you don't drive in winter. Also POR make a good exhaust paint, you use it inside and out the pipe, it'll never come off
The only catch with keystone is you have to do your homework first, go to driverfx.ca search the site for 'mandrel' or 'bend' etc. then take the part numbers and correlate them by visit the manufacturers sites to get the actual product details. Their are not many pics etc. at driverfx.ca they just have way to many parts to detail everything. When you find the bends that you want write the exact part number down from driverfx.ca, take it to any Canadian Tire and order it. If you go to Canadian Tire you won't pay shipping, your order will arrive quicker and it will be a few percent cheaper.
Neil