Plain yogurt

At the Mega, I bought a tub of what I thought was plain, unsweetened yogurt. The labeling said "Zero fat" and "Zero added sugar," and "natural flavor." Yet it is as sweet as it could possibly be.
I've since looked at Merza and several mini supers. Everywhere, even the yogurts that look plain have endulzantes.
Does anyone know where I can find plain, unsweetened yogurt - preferibly low- or non-fat?