I've been making my own corn tortillas using Maseca Masa Harina, aka corn flour. You basically mix the corn flour, some warm water and a little corn starch and divide them into small 30-40g balls. I flattened them using a cutting board and cut ziplock baggie. Then put them on a medium-high heat cast iron for 30 seconds a side or so (or until they puff up a little.) About 40 calories per tortilla and taste MUCH better than any store bought I've found. They also don't break nearly as easily.