Amazon Promotional Codes?

Well I keep getting these promotional codes for some reason.

They are codes for the game "World of Tanks" or something like that.
It says these codes are worth $8

I have absolutely no need for these codes so I am wondering if anyone would be interested in buying these codes, and if so, how much could I sell these for?

Not sure what "World of tanks" is but i would sell them half there og price so $4 people will see it as a deal not knowing you got it for free