In Australia at least, those cards are everywhere in populated areas. Supermarkets and department stores pretty-much all stock them. I’d say that over 90% of Australians live within 3km of a store that sells Steam cards and takes cash. Most of us even closer than that.

Your point is sound because I usually use a credit card for this, but most of my Steam purchases come from buying gift cards. However, I could easily buy those gift cards with cash.

Your comment implies this is not possible/common.

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