If you haven't already, check out this link for great info on the natural history of Rubber Boas:
www.rubberboas.com/
I don't believe these snakes typically have large litters, but I am not sure. If that is true, then it just adds to the situation of not seeing too many for sale. Then there are laws of course that restrict sales and interstate traffic on these snakes. So of the comparatively low number of folks that have them, most aren't advertising.
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Mark

