Meal worm bedding

I want to raise meal worms for my chickens (and other poultry) but I can't find any wheat bran, either in small bags or bulk. Can't find bulk oats either, could meal worms be raised on white wheat flour?Anyone living Vancouver Island or sunshine coast (Canada) know of affordable bulk wheat bran for meal worms or a substitute bedding / food for them?

I use 2 parts good dog food, 1 part alfalfa tabs, 1 part chicken layer food, blended into powder.  Meal worms are very pretty much just a container for whatever they eat, so if you want them to be a good food source, you need to fill them with a lot of nutritionally complete food.