Are you looking for “Protect my credit card number” anonymous, or “protect my whole identity” anonymous? The latter is going to be a lot more difficult, as most merchants will want to know exactly who they are billing, and lying about that gets into the realms of legal fraud.

Cash. Nothing beats cash.

Amazon can be done anonymously if you know how. Create a new account using a vpn to obscure your location. Wait a week or two encase Amazon closes the account. Buy a giftcard in store with cash. Have your purchase sent to an Amazon locker. Open the locker with either their app or a pin (depending on the locker). No name, phone number, address, credit card required.

Buy giftcards with bitcoin. In order for this to be anonymous, the bitcoin will need to be swapped for Monero and back again. That’s a lot of trouble and fees. Not worth it imho. https://coincards.com/ca/

Edit: coincards accepts many cryptocurrencies including Monero.