Double gold when purchasing

Hi there. Can any of you tell me what kind of deals can go together with the opportunity to buy and get the doubble amount of gold. I know 2 for 1 is not working, but what does?? I did read something in here about the subject, but I cannot find it again.
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It's found by clicking on the button to the right of your gold total at the top of the screen. Like most gold deals, it can't be used during Prime Time.
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