I am currently selling official Battlechest keys which you purchase right from the Blizzard Store yourself.
I will provide you with a link which I have kept private for some time now.
This promotion has gone on secretly for a while on the Blizzard website, but I have not seen anyone else selling, or giving away this promotion link. I am not sure when this promotion ends, so you will have to be quick.
I will be selling this for a total of 4.75 €. This means I will be getting 1 €, and the remaining 3.75 € will be paid by you directly through the Blizzard website.
I know I have a very low reputation on this forum, but I don't see the reason for scamming someone for 1 €. I am mainly doing this in order to promote this "secret" promotion, without it being flooded.
So, in other words: The only thing you will be giving me is the 1 € for the link. The rest will be done by yourself on the Blizzard website. I will not be holding your 3.75 €, nor your Battlechest key.
Here is a screenshot of the Blizzard website:
However, if you don't believe me I can try to prove this promotion in any imaginable way you want me to through Skype.
Add my skype if interested - imFluffeeh