A lot of pasta sauces have butter in them, personally my favorite pasta sauce is a homemade tomato sauce by Alton Brown (https://altonbrown.com/recipes/pantry-friendly-tomato-sauce/ ), it's vegan even though I'm not.

I usually do a double batch once a month (more or less, depends on how quick we use it) and it fills up 3 32 oz mason jars with 4-8 oz extra. It's amazing on pasta, pizza, eggs, burgers, meatballs, pretty much anything that's good with tomato. Cheaper and tastier than buying jarred tomato sauce by far, plus you can make it as chunky or smooth as you want by how much you blend it. Only costs a few bucks to make too.