Dungeons and Dragons Online: Forsaken Lands Expansion Pack

Module 3: Demon Sands was originally planned to be a paid expansion of this title. Turbine actually promoted it in Gen Con Indy '06 (August 10 - 13) etc, but they changed their mind and released it as a free module. Some companies and websites were still trying to sell it as a pre order for months or even years after the fact.