Gearbox Software offers SHiFT Codes for use on the PlayStation 3, Xbox 360, PC, or Mac versions of Borderlands 2 for free. That's tied with our expired mention from earlier this week as the best offer we've seen on these codes, which give you access to a Golden Key that in turn allows you to access certain in-game content. The codes:

• PlayStation 3: WBWJ3-JHKKJ-WCWW3-HJWJT-BW5SJ
• Xbox 360: WTCJJ-XT6HK-9ZR36-CX3BJ-W6HHT
• PC / Mac: CB5BB-XF65C-ZKXTT-TBBBT-TRKJZ