Razer is giving out 3 days premium bonus code and 7 days premium + 1000 gold invite code for the EU server, but only for Razer Comms users.
To get the codes you need to download the Razer Comms, which you can find here :http://www.razerzone.com/comms. After you download the Comms you need to login into your account using Razer Comms , and then you go to this website. For every Comms id, you get one bonus code and one invite code. You also automatically become eligible for a Razer peripherals giveaway.
When you’re done you can uninstall the Razer Comms of course, which I kinda recommend since it’s quite an annoying piece of software.