I would be careful with the cover as well. Most after market spa cover companies won't make the J-400 covers so you have to order from the factory. They use to run in the 600 range, not sure what they are now. Not to mention your in Canada.
You can order spa caps, I think Jacuzzi still sells them? Or try and find a car cover type thing, or just a plastic tarp that you could peel off.