I normally stock up on rats at the Reptile Expos. Other choices would be either Port Credit or Reptilia.
I breed my own mealworms, but I do buy waxworms, crix and silkworms in small quantities from either Port Credit, PJs or Reptilia.
If you are looking for bulk crix, mealworms, fruit flies etc, Cindy has good prices, as well as Grant at Port Credit.
Here is the link to Cindy's website:
Port Credit Pet Center:
Silkworms.ca for bulk silkworms:
Hope this helps!