The following site is a Canadian seed exchange site.
http://forums.gardenweb.com/forums/excan/
You can create an account and specify what seeds you have to exchange and post them. Or, is you just have too many seeds, you can post a Have seeds - SASE ... meaning if they send you a self addressed stamped envelope then you will send seeds without the need for a trade.
This is a great site!
Comment Guidelines
We welcome your feedback on Houseandhome.com. H&H reserves the right to remove any unsuitable personal remarks made about the bloggers, hosts, homeowners and/or guests we feature. Please keep your comments focused on decorating, design, cooking and other lifestyle topics. Adopt a tone you would be willing to use in person and do not make slanderous remarks or use denigrating language. If you see a comment that you believe violates any of the guidelines outlined above, please click “Alert a Moderator.” Thank you.
Thanks for sharing.
K