Boa constrictor longicauda are readily available in captivity. The true rarities are the Dominican clouded boa Boa constrictor nebulosus and the St Lucia boa Boa constrictor orophias. Try to find those readily in captivity.
Thanks Doc, but I dont mean rare in captivity. nebulosus and orophias have been around before, albeit was 15 years ago that I saw them regularly posted or available. What the current status is I am not sure however I do not doubt that they are suffering since they are still collected for oil last I heard.
But when was the last time someone went down and found a longicauda in the wild??? I would imagine most of the insular species are few and far between except for Hogs and Sabo's, but when was the last time someone collected, studied, or imported a longicauda from Tumbes?

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Cheers
Lateralis
"I would rather be precisely wrong than approximately right"
Marion "Doc" Ford