La Tortilla Factory tortillas have about 3-4 net carbs per medium-sized tortilla. They're reaching more and more grocery stores and Walmarts, so keep checking if you haven't found them yet.

Mission LC tortillas have 4 net carbs per small tortilla, but they are DELICIOUS. Soft and tasty, just like they're supposed to be. I'm currently very addicted to them. Found them at my local grocery store; if your store carries Mission tortillas then you may be getting the LC ones soon.