They will definitely take some looking to find. There was a discussion about them in the Colubrid forum not that long ago.
DO a google search and you can probably find some for sale. They're basically lizards in snake form and should pretty much be cared for that way. If that fails, Glades Herps usually has a vast selection of colubrids, including rough greens.
Rome did not build a great empire by having meetings, they did it by killing all who opposed them.