I currently do not have the Get It Now option not until my auction ends tomorrow but then by then I won't be able to change it since someone has bid already
The code I have is from Pre-order on PS4 but since it runs through the Call of Duty website it applies it to your COD account instead of a console so it works for everything
NOTE: This Personalization Pack is only available in Call of Duty®: Ghosts for Xbox One®, Xbox 360®, PS4®, and PS3® and in Call of Duty®: Black Ops II for Xbox 360® and PS3®.
Found that on the Call of Duty website. Sadly it will not work for PC.