I like tostadas as a way of serving some types of salad and salsa, but some popular brands that are in the stores are loaded with fat.
One good one that can be hard to find is Tostadas Buena Vista, which comes in three varieties, Corn, multigrain and a whole wheat with flax. They contain only 2% fat. In our area you can get them at Frutas y Vegetales La Reyna, on the corner of Westchester Avenue and Beach Avenue.
Another brand which is also very good is La Gavillera, which has 4% fat, and that is still acceptable to me. In our area it is available at Chang-Li Supermarket on Benedict Avenue, across the street from St. Helena's church.
Many of the supermarket brands, like Guerrero have very high fat content, and you want to avoid them if you are serious about whole foods, plant-based nutrition. In terms of recipes, I previously wrote about my favorite meals to serve on a tostada, cactus salad & black bean salsa, but this year I will be developing more.