exchange your amazon giftcard with paxful traders. Go to paxful.com and sign-up. Once successfully registered, you'll be able to to exchange it with paxful traders in exchange for bitcoins.
For you guys wants to buy gift cards such as Amazon, iTunes and others using your bitcoin, you can do so by signing up thru www.paxful.com It is a secure and trusted site where traders do the buying and selling of bitcoins and giftcards. Just so you know.