Up for sale is the first US pressing of Game of Thrones Season 1. This is the version that has the George Bush head scene, as well as the commentary track speaking about it. The scene was later removed after backlash perceived it as an anti-conservative political statement.
Proof:
1) See the third photo. I took a screenshot of the scene at the 11:32 mark.
2) I wrote this transcript down from the commentary track, which takes place soon after the 11:32 mark:
Producer 1: "The Last head on the left is George Bush"
Producer 2: "George Bush's head appears in a couple of beheading scenes"