You feeling spooky, punk? We're reactivating these SHiFT codes for a limited time! Use these SHiFT codes to unlock the Spooky Skins for Borderlands 2. These codes will expire 11/04." : r/Borderlands2
A lot of you probably already have done this but for the few who haven't come by this code yet it's still currently working and is for 100 gold keys : r/Borderlands