Connecting with Models can be tough. Especially when sites like Model Mayhem don't pre-screen their applicants. Fortunately, a new site called Portbox is doing just that. Postbox is a pre-screened network for both Photographers and Models that is currently invite only. Postbox wants serious photographers only so you must have an existing portfolio with examples that show "a strong professional interest to work with models/photographers in fashion, glamor, or commercial modeling photography."
According to many users, the site's booking system is easy to use and simple for booking appointments. Portbox currently has 3 pricing plans: FREE, Elite, and Pro.