forgot to add to above, they are (in my experience) the most interactive snakes around. They don't constrict, they are awake 24x7, like (but don't need) areas to swim (mine doesn't at the moment have a swimming bit) and are the easiest (if they eat defrost) snakes on the planet to own. they make corn snakes look hard.
there is a guy selling them for £20 up here iirc. Tempted to sell Lemony if someone wants her. More carpets and royals wanted, so the space would be good.