I looked into this too. nostr:npub1sg6plzptd64u62a878hep2kev88swjh3tw00gjsfl8f237lmu63q0uf63m was talking up Azteco a while ago. The issue is that you can only buy the prepaid cards at vendors in a few south american countries. Obv anything online requires a credit card
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Bitcoin meetups are also an option but you can’t exactly go to a meetup with a few bitcoin worth of cash in your pocket hoping to find some dude who will trade you bitcoin for it