I have raised meal worms and black soldier flies and the later are even easier. This is a good review of how to raise either but you do not have to buy the black soldier flies , they will voluntarily find the bin . They also do not have the other stages to deal with or separate as the flies just fly away after laying their eggs. The black waste from the flies is great fertilizer also.
Just something else to think about to feed to your chickens, guineas or fish.