BF4 Social Engineering

So, I'm thinking of doing some Social Engineering to gain a key since I'm not too sure about purchasing it (I did cancel my pre-order 5 days before release date). If any of you guys out there have a key that is already activated could share the key with me so I can use it for my Social Engineering, it would be great.

I don't think anyone would give you their code.
Just get a key for 30 bucks.

Is that in US$ because over here in Australia the cheapest key is $45. The reason for me being picky is because I've heard quite a fair bit of negativity from friends and reviews. I've heard the campaign is an appalling 4 hours long and there is no Co-op mode.