You can get 36% more value of Amazon gift card when you sell bitcoin in Paxful.com. Is it too good to be true? Is it a scam?
If it's like 40% and above, then its too good to be true. The gift card will be either from a cracked Amazon account or bought using some black hat methods. And since the seller wants to get rid of it asap he will sell for extreme discounts to some dumb asses. Better to stay away from such deals as you don't want feds knocking up your door the next day or risk your Amazon account.
Like the above user mentioned Amazon codes have limited use cases and cannot be used to buy anything anywhere. Usual trend on Reddit or some exchange sites is you can get $100 Amazon card for 80% BTC. This is normal. But usually, its better you verify the source of the Gift cards before purchasing any.