Clasico makes a tomato sauce that they don't tout as low carb, but it's the lowest carb sauce I've found. It's 4 gm net carbs per half cup so pretty reasonable. It's the spinach cheese sauce. It doesn't taste like spinach or cheese, but I guess adding those two ingredients keeps the carbs down. It's the only tomato sauce I use now. Better than anything labelled LC that I've found.