You live in the USA... I thought that it's pretty easy to get everything what you want (legal or not), the only thing what's required is money.
If Salvia is legal in the state where you live, than you can buy it over the Internet.
But what i've heard from Salvia is that it's a pretty intence trip what doesn't last very long, and it's also not very cheap. And the best way to take it, is to smoke it via a pipe and you'll have to heat it with a powerful flame (not with a normal lighter). And you'll need to keep the smoke in your lungs for a while (something what isn't always as simple as it seems).
I recommend you to try some shrooms instead.
But don't just buy and eat them. Learn about the magic mushrooms (and don't use information from for instance the DEA or other anti-drug facilities, because they don't tell you the truth).
If you get well informed about the shrooms, that will grow your interest for them and the trip will be much better.