I recently got two $50 World of Tanks cards that came with a bonus code and an invite code. I used the bonus codes and have the invite codes left over. They are each for 2500 Gold on a new account. I am asking $4.50 for each. 2500 Gold is usually $14 so it's a fair price.
Here's an other thread with vouches on it:
http://pcpartpicker.com/forums/topic/6125-selling-4-awesome-downloadable-pc-games
Here's an other thread with vouches on it:
http://pcpartpicker.com/forums/topic/6125-selling-4-awesome-downloadable-pc-games