There are a number of wonderful heirloom seed businesses in Canada as well.
Some of my favourites are:
Heritage Harvest Seeds:
http://www.heritageharvestseed.com/Salt Spring Seeds:
http://www.saltspringseeds.com/Annapolis Seeds:
http://www.annapolisseeds.com/The Cottage Gardener:
http://cottagegardener.com/I have had great experiences ordering from all of these companies.
Heritage Harvest Seed has always included a free packet of seeds with my orders and have a great selection of some very rare dry bush beans. They recently set up a Facebook page, and if you "Like" their page you are automatically entered to with a monthly prize of a $25 gift certificate. A friend of mine won it this month!
Salt Spring Seeds stands out because of their friendly customer service, the excellent selection of medicinal herbs, and a page devoted to 1/2 price seeds. The fellow who owns it, Dan Jason, has always been friendly and generous with advice when I have emailed him. A great small business, and a really nice fellow.
I have a soft spot for
Annapolis Seeds because it is based in Nova Scotia and I am from there originally, though I now live in BC. Annapolis Seeds was started by a young fellow named Owen Bridge when he was still in his teens. He regularly volunteers to give presentations about seed saving - in fact, he once hitch-hiked with all his gear from his farm into Halifax (quite a distance!) to give a presentation at one of the universities. My mother attended that and enjoyed it a lot. He seems like a very kind, gentle sort and obviously has a real passion for heirloom seeds and does what he can to share that with others.
In Canada, the biggest and most established resource for heirloom seeds is
Seeds of Diversity. You can sign up for their free online newsletter, and their annual membership is reasonable ($25 or $40, depending on how you'd like to be involved).
Every year, they publish a catalog where members who have grown heirloom seeds make them available to other members. There is a small fee for the seeds but that is just to cover shipping and packaging costs. Also, on their main website, they have a lot of resources - a list of the seed companies in Canada, lists of Seedy Saturday events, a big library of information about heirloom seeds in Canada (including which are rare, etc), and the opportunity to "adopt" various heirloom varieties so they will be maintained in their seed bank. I would love to do this at some point, but will have to save my pennies, first.
Their website is:
http://www.seeds.ca/en.php The site is also available in French.
Salt Spring Seeds in British Columbia is a great heirloom seed business and is also closely aligned with (or perhaps was the creating force behind?) the Seed and Plant Sanctuary for Canada. They maintain and catalog many heirloom varieties, and some they sell to the public, too. Here is the link for that site:
http://www.seedsanctuary.com/Yesterday, I discovered a link to a small, privately run seed bank in BC called the
Populuxe Seed Bank. This person is gathering heirloom seeds, growing them out, and making them available to others for free.
http://www.theseedbank.net/ 
