I make my own. Cut up (organically-grown) corn tortillas, a little (unrefined) oil and (sea) salt and bake in the oven till crispy. For variation, I add my own spicy flavors.
No preservatives, very low fat and sodium and still cheaper (and fresher and tastier) than a purchased bag of chips.
Then again, I make my own salsa (with my home grown tomatoes).