There is no rent on Calypso. You buy a deed from an Entropian that holds it currently and then it's all yours . I think current average prices for Calypso are maybe like ~450-550? Not too sure on that.
I sold 3 about a week ago. Depending on size, how close it is to the tp, and weather it has a balcony or not, what complex it is located in. They run from about 400 ( very good deal ) to about 650, with an average of a
About 450~500. All just depends on the bells and whistles you want.