Dubia roaches are a good feeder and you can start your own colony. Silkworms, tomato hornworms, dull colored moths, cultured houseflies are all feeders you can use. Check out kingsnake's Canadian ads to see if there are any suppliers you could use.

Not all of us can get a huge variety of feeders. But, if you gutload your feeders carefully that may be more important in the long run.