Buy anything you want from Amazon with a discount!
I can transfer the balance to your Amazon account via Gift of Prime trick. You don't need the prime membership to receive your gift card balance via this method. There are $39 and $119 denominations.
I use Bitcoin as the payment method (possibly Ethereum if you ask before) via coinmarketcap rate.
I'm also buying if you need to get rid of unspent amazon balance for BTC fast (for slightly lower precentage).