I bought a pack of Aponogetons and 2 out of 3 grew. I can't remember how much they cost, but it was a pretty good deal, I think. They are really nice if they do sprout. I find they like some extra light, and sprouted when they were placed closer to a window.
Be careful if they do sprout, they grow really tall, and you can't trim the leaves either! Mine are at least a foot tall and still sprouting leaves.