Q: Where can I see the really rare Sarracenia species?
A: What? You driving me crazy? There is no way I am going to tell you this!
The really rare Sarracenia taxa, namely
Sarracenia alabamensis, Sarracenia jonesii,
Sarracenia oreophila,
Sarracenia purpurea subsp. purpurea var. montana, and
Sarracenia purpurea subsp. purpurea f. heterophylla,
are so heavily threatened by poaching that if I told you where they could be found,
there would be a special roasting pan in hell reserved with my name on it. (I also think that some of my friends in the US
Fish & Wildlife department would be happy to take turns rotating my roasting-spit.)
As for places to find special color morphs of more common species,
like a yellow-flowering Sarracenia psittacina, etc., the previous paragraph holds again.
Am I cruel, or what?
As a weak consolation prize, let me point you to a FAQ page or two which
talks about ICPS Location Codes for rare carnivorous plants. That's all I can give you.
Page citations: Rice, B.A. 2001a.