Mexican food is one of my favorites, but so many places around LA rely on inferior, unhealthy ingredients like lard to lower the cost. I'm willing to spend an extra dollar or so for food that's cooked in a healthy vegetable oil without all the saturated fat. One of my favorite places is Alegria in Silver Lake. Any others out there? I'd especially be interested in a clean-tasting burrito chock full of good stuff like grilled chicken, guacamole, tomatoes, whole black beans, and rice.
I don't think the point behind using lard is to save money... in fact, if anything, it might cost more to use lard; I think it's used in a lot of Mexican places because lard is a common fat in the cuisine of at least certain regions of Mexico, and because people like the flavor it adds to food. I don't eat lard because of being vegetarian, but I think there are plenty who would disagree with you that lard is "inferior". Keep in mind that certain vegetable oils have various health issues of their own, and that saturated fat isn't necessarily bad.... if you can, have a read of "The Queen of Fats" (about EFAs and why a proper balance of EFAs in diet is important). Regardless of your feelings about lard, putting it that way in a message is likely to alienate some of the folks who might be able to provide a good answer to your question.
Taco Station in Pasadena makes their tortillas in-house, and I believe they should be made without lard, as the place has a number of vegetarian / vegan offerings as well as more standard stuff. You could also try Chichen Itza in South LA (the Macarthur Park location has been closed for a while). I am not an expert on Mexican cuisine by any stretch of the imagination, but I think you will have better luck with lard-free food at Oaxacan and Yucatanian places.
3655 S Grand Ave, Los Angeles, CA 90007
4088 Mission Inn Ave, Riverside, CA 92501
I'm a fan of lard (for flavor and for the sake of being a traditionalist) but the food at Tacos Por Favor on Olympic in Santa Monica is decent and lard free. You might be spending that extra dollar just because it's on the west side, but the prices are still reasonable.
Tacos Por Favor
1406 Olympic Blvd, Santa Monica, CA 90404