My chickens love those Grubblies but they can get too expensive. Black sunflower seeds are my other option since I found out most of those mealworms are actually shipped from China until I can raise my own mealworms.
About a $3 per pound difference. Grubblies are cheaper the more you buy and if you set up auto ordering you get 10% off.
I also like that they use pre consumer food waste to feed them. Recycling and repurposing.