Don't ever let me loose in Petsmart (or any pet store for that matter) with a store credit.

I tend to feed my mealworms things I normally buy for myself anyway (I eat my weight in oatmeal, I swear) so it is no added expense to feed the mealworms. (so far anyway. I only have a small colony going) Oatmeal, cornflakes, and bran flakes (enough for a decent sized colony) shouldn't cost you any more than $10 per month and if you normally keep fresh veggies around, just give them the scraps. (broccoli stems, carrot tops, potato peelings) Around here, its over $2 for 50 mealworms. My single leo puts away at least 10 a day at minimum. That's at least $2-4 a week on feeders for her. It is a lot cheaper to breed my own.