I know of two strap sellers, one sells kev ammo straps and one other is selling straps he personally makes, they are also very nice and handmade. If you are interested send me a message and I am happy to share the details with you, before you know it, they make so much money they start driving Ferrari cars
As somebody mentioned, Combat Straps in Montreal makes a lot of Panerai straps. But you don't need to restrict yourself to Canada. I live in Toronto, and I've had straps shipped here from Turkey, Italy, USA, UK and Holland with no problems. There are a ton of amazing strap makers, it can be overwhelming. The straps I have and LOVE are from Bosphorus, Handmade Watch Strap (Sanders), Simona DiStefano and Kostas. Other makers I have admired from a distance are Vintager, Greg Stevens Design, Kyros, Kevin Ammo, Toshi, and... I know there are more, but start by looking all those guys up. I'm sure other people will have good suggestions too.