Freshsalvia.com will ship rooted plants, all you'd have to do would be grow them a couple of months and you could clip your own clones. It's hard to get seeds off of them. It's easier to let them get tall and fall over to reroot. The seeds are tiny and dont germinate well anyways.

http://www.trawka.org/viewtopic.php?t=16349
This is my grow-journal Salvia Outdoor 2009.
This is at Polish language, but there are many pics, still updates also.
Salvia can grows on many various biotops f.e.: on very sunny pleace too (not only beside streem in self-dark wet forest).
There are any dangerous for Salvia outdoor especialy big rain amd wind (may make slots on leafs or even brokes stalk, plants grow up slowly then at home, wild animals etc. But leavs never dry on tips nor roll down like at window sometimes!

Plant in the self-dark and wet forest


Plant on sunny pleace - the difference is huge, really - fat wrinkled leafs, very low height.