I think that a picture should be required on site and not previewed on another website along with state, shipping costs, if they even will ship to you(some that I have seen don't want to), NAME, hatch dates, maybe a website. Shipping cost, name, and state are definitely good ones to add. Also...
There should be a way to search for geckos in a location or state in the sale area of the site so people can find pets that they want to own in a certain area without having to worry about shipping.