Can you buy salvia bong with more potency?

No, but you can probably buy one large enough to hit yourself over the head with it and get a life...then again, maybe not. Anyway, try smoking basil, tarragon, catnip or oregano. Like salvia, they are all members of the mint family and have pretty much the same psychosomatic effect, that is, nothing at all. If you are genuinely that stupid, God bless you.