Custom wheels in Canada for the corvette I have not heard of yet, quite a few places will carry the US suppliers up here though (corvettedepot, tdotperformance, partsengine, wheels.ca, 1010tires) but I will be honest you are better off looking in the US for replicas, better options and sizes.
If going custom, US is your main marketplace, you an order from CDN distributors but your better off just going through the company itself at that point. Most of the companies who do custom wheels will get back to you rather quickly, but be prepared to spend $$$ as rotary forged and forged cost quit a bit, but one of the best is BC Forged wheels.