I got some codes that came with my logitech G9x mouse for this game a few months ago. I don't have any intentions on playing it, so I'm going to link the codes here for anyone who finds this first, to use.
One of the codes is a "INVITE CODE" for new accounts only, says it gives you 2000 gold.
Use this code and create a new account
Other code is a "BONUS CODE" for existing & new accounts. Its for 1 week premium account, Matilda Tank and a garage slot "more space for your tanks!"
Login at worldoftanks.com. Click your username
. Select and enter bonus code