I honestly haven't completely worked this out as I've only had my leos for a week or two (I honestly can't remember right now >__<).

I have 3 leos and a fat tail that all eat mealworms. My female leos are trying to eat me out of house and home. I am going to guess I will be spending $5-10 a week on mealworms if my females keep eating the way that they do. A container of 50 mealworms seems to last between 2-3 days for me and cost about $2.10.