Honestly, I won't buy Amazon gift cards for BTC any more, without a 45 day escrow.. .Nobody else should either.
We've been burned too many times by Amazon removing the card value from my account 25-30-35 days later when the seller turned out to have used a stolen card to buy the Gift card he sold you.
Pity, because I loved getting 10%/20%/etc off..
So now I use purse.io and avoid the gift cards.