Oh God, whatever you do, DON'T patronize R. Nicholls. They have an incredibly poor reputation with the civilian community for shunning them in favor of law enforcement only, especially when it comes to firearms that they're the exclusive importer for (ie. Fabrique Nationale).
If I were to recommend a retailer, my first choice would be
Wolverine Supplies, followed by
The Shooting Edge. Both ought to stock EOTechs. As mentioned above, eBay is also your friend. Hope this helps, and welcome to Canada!