http://goindustrial.ca/index.php/en/ has the mold silicon but be prepared for sticker shock, that stuff is not cheap. an alternative for some molds is Plaster of paris or Durhams Water Putty (pretty rare in Canada but I have found it at Windsor plywood). The big thing with those is no undercuts or use a flexible master.
I go my plastisol from PM hobby craft north store I think the person to talk to is Rod I have the contact at my office. They don't stock it but when I got mine they piggy backed it with a big store order so you can't be in a rush the order happens when it happens, but no shipping cost which is nice.
one other thing to consider is colorants I got epoxie dyes from industrial paint and -plastics but they are iiffy they bleed a fair bit so I would get dyes right away too. So to start I would say couple gallons base resin, softener, heat stabilizer, and a base set of colors
or there is a Canadian lure parts web site
http://www.luremaking.com/ they have it as well, but I have not ordered from them yet so IDK about customer service.