Are you looking for the 4 pack ghouls night out dolls? This set includes Rochelle Goyle, Ghoulia Yelps, Clawdeen Wolf and Venus McFlytrap. They were first release in Mexico and according to some source, the price are around $80.
If you only like Rochelle Goyle, you can purchase her separately but if you like any of the three, you really have to get this set because they are exclusive dolls.
If you're looking for the single packs for Rochelle Goyle, Spectra Vondergeist and Lagoona Blue please follow this link http://www.squidoo.com/monster-high-ghouls-night-out-dolls