Does anyone know how I can "swap" gift cards to be used for different stores?

Mr Snarp Snarps

CAGiversary!
In other words I have a Cinemark gift card and I want to change it to Amazon (or something like Amazon, it dosen't matter. Just not Cinemark) Could anyone enlighten me?
 
I have used plasticjungle, and they are good. I have also used a number of other gift card selling sites, and every one I used has worked as promised.
 
bread's done
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