Did a search on some of the big US sites just to see what's available. Only found Ultramax and Ten-X that make it in factory loads. Never heard of those brands before and I'd be willing to bet they aren't approved by NRCan as it's likely no one has gone through the approval process to import them before. No NRCan approval means it'll be quite difficult to get them into Canada (and not technically legal to do so based on some sources). They're also US$1.50-$2.00 per round.
I'd start looking into dies, brass, and a custom mold for casting if I were you. Looks like Accurate Molds in Utah has a heeled design in their catalogue for the .41 colt.