Looking at Real Seeds website, I see that they do not ship outside of the UK. However. They provide a suggestion for USA gardeners: Adaptive Seeds. Isn't that nice & thank you, Beanmad Nanna

.
Okay, that company has shown up before in my perusing of the web (although a quick search on this thread, it didn't show up). And yes,
Adaptive does ship to Canada 
. They also list some of their seed suppliers (Isn't that nice?) ~ the one I looked at defines itself as a "contract" seed grower and is in Western Washington, a couple of others are and the remainders are in Western Oregon.
the below will be of interest of only a few:
Adaptive is an organic, non-hybrid outfit. Perfect Rogue tomato seed caught my eye
LINK. It's developed from Early Girl but is a potato-leaf, semi-determinant. I was around when Early Girl came on the scene, grew it for years and watched how its popularity spread across the US.
Several times, when I have had a good number of starts growing in the greenhouse, I have come across potato-leaf plants. I grew some of them and shared the plants with a neighbor. This may not be how Perfect Rogue had its start because, I assume that they did an F1, F2, ... F
something, that they called, Perfect Rogue. I could be wrong and I'd like to see some customer reviews regarding disease resistance. That was the problem with those potato-leaf Early Girls.
I'm NOT trying to discourage anyone from trying it. To the contrary, I want to see some reviews

! A disease-resistant OP Early Girl could be a great addition to a seed-saving gardener

. It relates to what someone (
@AMKuska 
) living in the same part of the world as Adaptive and their seed sources was commenting on recently.
Steve