Bitcoin Co is one that doesn't require any registration. Fold is another (but requires KYC). I'm in US so can't speak for how these work out of US.

aoeu

Coin cards looks promising. Thanks for sharing 

Bell_curve

Bitrefill is one. There's also Coincards. A few others as part of platforms, and some wallets have their own thing integrated I think. 

Like bitrefill? Do you mind sharing it or it works only in your country?