looking for used game cards

so i'm starting to get back into my designing and sewing and crafting and well i'm not sure if anyone
who reads this plays world of warcraft but they have game cards (gives you time to play the game) and well i'm looking for the used up ones. so if you have any or know anyone who has em PLEASE send em to me I'll pay the postage and their name will go on a list of credit towards them for the donation. thanks :)