If you're into Borderlands 2 and haven't picked up any DLC or the Season Pass yet, Green Man Gaming has a pretty sweet deal on for a limited time. Right now, they've put the Borderlands 2 Season Pass on sale for $22.99 which is a savings of 23% and a really good price for the upcoming downloadable content. The Season Pass includes four DLC packs normally priced at around $10 each so you're saving a fair bit in the long run.
Although it would have been nice if the 20% off voucher worked in conjunction with the sale price, unfortunately, it doesn't. The good news, though, is that you get cheaper Borderlands 2 content! One of the downloadable content packs is available now and the other three are set to release before June 2013.
The deal is live now and the content downloads and activates via Steam.