If finding, designing, printing, organizing, assembling, and addressing these damn invites wasn't enough, of course there would be problems with mailing them!!
I brought them to my town's post office, and the guy told me they all needed another $0.20 because of the bump in the middle from the ribbon. Now, this is the most tiny, minute bump there could be, and I still even brought it to work to double check it fit the size standards. Anyway, he put postage on my invites to Canada and then asked how many of the pre-stamped invites I had, and I told him never mind and I would go back another day.
This morning I went to the post office I visit every day for work, and they were so happy to take them and mail them for me. I don't know why I didn't just go there in the first place. But whatever... they are DONE! Gone, out of my sight, and now I can't wait to see those RSVPs!