I'm sorry to tell you this but these advertising vouchers are selling for 10x less than that.
Where ??
Nowhere. I just give them away for free.
I don't use that site anymore, but when I did, I saved up to 0.05 BTC and gave it away for free.
Nobody will buy the code, trust me, especially when it's barely off retail, it's pretty much useless.
If you don't believe me, countinue trying.