Just a heads up, that if you in Australia and are tempted by the Duke Nukem Forever special on Steam at the moment US$24.99, you may want to consider the following:
US Steam Store Special
(via gift from a US friend) - Save 50% on Duke Nukem Forever on Steam
US$9.99 - Base game
US$14.99 - Base Game with the Brady Guide
Parody Pack is US$9.99 instead of Australian price of US$12.99
Note if you had signed up to the First Access Club (i.e. pre-ordered or owned Borderlands I believe) you should have received an email about getting the DLC code for free in the last few days.
- Green Man Gaming
US$15.96 - Base Game (Std price of $19.95 less 20% using the voucher advertised on their home page - currently AUTUM-NSALE-20PEC)
You'd need to still buy the DLC via Steam assuming (a) you wanted it, and (b) don't have a free key.