You can grow the mealworms yourself. Use a plastic tub, fill with wheat bran, nestle a chunk of carrot down in the bran, add worms, put piece of newspaper over top of bran ---instant mealworm farm. The worms will turn into black beetle bugs(they can't climb out of the container), the beetles will lay eggs and die, eggs hatch into worms, worms into beetles.....................you get the picture. I had the same culture going for years.
They get moisture from the carrot(you'll need to replace when it's all dried up.) and eat the bran(which will need added to or replaced eventually too).