Or you could try no sauce at all. If the ribs are cooked right, sauce is an afterthought, not a necessity.
On sugar in ketchup, around here, there are two versions of every major brand. One is regular (HFCS), and the other version is "natural" or "simply". Meaning they use sugar. Heinz, Hunts, and even HEB make HFCS free versions of their regular versions.