you can buy them at a craft store. now to just wait for some decent tomatoes. you’d have to buy the inserts separately, however. there is not one thing that i could say that was bad about this film. i'm going to open it up with a screwdriver here, and actually show you how easy it is to wire and what is actually going on inside the unit itself. i cooked 4 different dishes with 3 servings each for my 5 days. 