About once a month I have an appointment in a distant neighborhood and the drive takes me directly by a St. Vincent De Paul Thrift Shop. It's a large store, dusty and low tech, but the staff are nice. I always try to make time to stop in and check out the bags when I am in the area.
Most of the bags are marked $3 or $1 ($5 at the most) they do have a few slightly more expensive bags behind the counter but they are usually "nothing much" or fake. Often the bags are just piled up in bins and shopping carts and you have to dig through them.
Sometimes I don't find a thing (and I have picked up a couple of fakes there but for that price I don't mind - especially since I know that the money is going to charity) but I have also found some nice items there at very cheap prices.
I've just looked them up online and they do have some SVDP shops in Toronto and elsewhere in Canada, see link below. I don't know if they are located any place close to you or if they offer a large selection of bags; but if they are anything like the SVDP store that I visit, then they don't know bags and they slap a cheap price on them! Good luck!
http://www.svdptoronto.org/v2/stores-distribution1.html
Here are a few examples of genuine items that I have picked up very cheaply at the SVDP store:
Coach Black Court Bag ($3)
http://forum.purseblog.com/coach-shopping/authenticate-this-coach-694619-742.html#post22029506
Ugg bag ($5)
http://forum.purseblog.com/authenticate-this/authenticate-this-ugg-138289-2.html#post21786106
Kate Spade black cosmetic bag ($1)
http://forum.purseblog.com/authenti...-this-kate-spade-416419-157.html#post22118026