Black milks are pretty cool, too. They take a while to get fully black, but turn out nice and are in 6ft range.
In case anyone was really interested in indigos:
Federal
"The Federal (USA) Government considers Eastern Indigos (Drymarchon corais couperi) "Threatened" or "Endangered". Classified as such, they cannot be sold, traded, or bartered for in interstate commerce without a federally issued permit.
State
It is illegal to keep/breed Eastern Indigos in Virginia, Florida, Georgia, New Jersey, & Mississippi without a special permit.
And they're expensive. But texas indigos have no special permits required.