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You can buy Steam Wallet Codes in retail stores that sell them. They work much like prepaid SIM load cards where you uncover the codes by rubbing a coin on a special area which will reveal them. Afterwards, you can enter them into a page in Steam which will credit the pre-designated amount (such as a $100 Steam Wallet code) to your Steam Wallet.

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I see, thanks for the information. It's probably going to be quite some time before itch.io has something like that.