Collectors of vintage sewing machines and sewing paraphernalia may be interested in an auction taking place in Napanee, Ontario on December 17, 2016:
http://www.timpotter.com/auctions/121716.html
They will be selling a collection of antique sewing machines, as well as buttons, pincushions, and other sewing paraphernalia. There's a link to a photo gallery, but it doesn't show the complete collection. The description mentions "3 treadle machines" which aren't shown at all, so there's obviously more than shown. Some of the sewing machines are children's toys as well.
Napanee is on Hwy 401, a few hours from Toronto. It's also close to the Thousand Islands border crossing in NY State. I know there are a lot of members in Ontario, but some American members might find this close enough to get to as well. (And don't forget, the Canadian dollar is only worth about 75 cents US, so it might be a chance to get a machine at a good price!)
Thanks to Patrice for giving me permission to post this!