Since my Neps are outdoors, they do pretty well for themselves catching ants, flies, and other stupid insects that fall prey to them. Occasionally I will supplement with mealworms and flies that come into my house. For my lowlanders on the windowsills, I supplement with mealworms and flies that make it into the house. I usually leave a door or two open when I'm out back gardening to induce flies, but most people aren't as nuts as I am. So stick with the mealworms cuz you can keep them in your fridge for many months and they don't stink!