Donate it (that should work everywhere right?), or if you want you can claim US Amazon gift cards and use it, there is a way around it even if you're not US based but you can only get electronic delivery things (barring gift cards) unless you have a person you trust to ship it to you from the US.
Basically with my Amazon account I can sign into amazon. in or amazon. co. uk or whatever just go directly to Amazon's site for that country and use my same Amazon account. I can then add my gift cards or just use same old payment methods to buy things.
So what you'd do in this instance is claim Amazon gift cards stating US based then sign into Amazon. com and add the gift cards to the account. You can now use that gift card balance for things like kindle books unless they changed their terms from when I did this a while back.