Hi Alicia -

Here are web sites which may help:

CFA - Cat Fanciers Association, has a breeder locator here:
http://secure.cfa.org/Search.aspx

Note they have Manx SH ad Manx LH; I didn't know whih you wanted; a few places in Ontario did pop up.

TICA - The International Cat Association, has a breeder locator AND a breed rescue, check the menu down the left side here:
http://www.tica.org/html/english/home/

The Maine Coon Breeders and Fanciers Association web site starts here:
http://www.mcbfa.org/

I could not find the Manx breeder group, but you can probably find a link to them on either CFA or TICA sites.

Hope this helps!