well, they're super potent, and probably wouldn't be terribly popular, as many find salvia not terribly fun. That being said, I think there are a few out there. Be careful if you try them, as they're most likely active in the microgram range
^ Salvinorin B Ethoxymethyl Ether. Theres a couple of threads on it here already, not much info, besides whats in the original etheogenreview article and on erowid. I would love to try it, but I doubt it will ever hit the mainstream 'market'.