I have been reading up on this. I think there are certain things you should be aware of. This is from robosats docs:

Amazon eGift CardsPermalink Amazon eGift Cards are one of the more private payment methods on RoboSats. They tend to be quick and convenient, but funds must be spent on Amazon.

It is important to not share a giftcard code directly on the chat, as this might lead to difficult to solve disputes in case of fraud. As a seller, do not accept a giftcard code on the chat. Instead, the seller should provide an email in chat. The buyer should buy a new giftcard explicitly for the trade and have it sent to the email address of the seller. This way the seller knows he is the only one to have access to the redemeable code. This apprach also generates verifiable evidence that the giftcard was bought for the RoboSats trade in case of dispute

This is from the bisq site:

Disambiguation Amazon eGift cards are bought on the Amazon website using your account, and sent electronically to the recipient, not the paper vouchers that contain a visible code, and that you can buy at shops for cash. We understand the latter are more private because there is no name attached to the payment, but they also come with risks, namely:

no payment proof: the seller can claim the code was already spent on receipt, and neither the buyer nor the mediator have any means to ascertain either way illicit origin: code vouchers could be obtained through scams, and the recipient account could get the balance erased as a result, and his Amazon account banned For these reasons, Bisq only allows for eGift cards.

Welcome to Stacker News, yes Amazon US Gift Card is one of the payment options.

If you are thinking of using RoboSats, you might find this post from today interesting:

#866519

Yes. You can absolutely sell Amazon gift cards on RoboSats for sats or other payment methods.

You still have to secure the trade with a maker bond on lightning though.

I saw this on Telegram today:

My regular daily service announcement. : )

When using Amazon gift cards for payment, please have your anonymous email set up. I have used Simplelogin for a while now and it works great. https://app.simplelogin.io

Is it possible to transfer/unload (not spend it) the fiat from one of those cards somewhere else?

I'm asking because if not, the buyer could give the code to the seller and, after the seller confirms and the sats are transferred, and try to spend the card before the seller does.

I've never used one of those gift cards, so I may be missing something that prevents that?

You could. You'd need to send the other party the code.