Recently I've been buying "Yo Mama's" sauce (no it's not the setup to a joke, it's actually called that). I first picked it up because it has lower amounts of sugar and salt then most retail sauces and liked the taste enough to keep buying it. It's fairly pricey though, usually eight or nine dollars online, but the local Grocery Outlet (a discount store in case you don't have them in your area) usually sells it for around five-ish.

One problem though, the lack of preservatives combined with the low salt and sugar means a jar can start to go bad relatively quickly. I've had more than one jar go fuzzy because I decided to take a week long break from eating pasta.