They’ll be labeled as gift cards and tend to only be available in fixed amounts.
The nation-wide chain of Simon Malls all offer gift cards that can be purchased in any dollar amount from to 0.
The non-reloadable prepaid cards that you’re looking for will be somewhere on the same rack.
The cards can be used to fund a new Pay Pal account, which allows us to avoid the final limitation, if the foreign merchant accepts Pay Pal.
You can also sign up for subscriptions with a Pay Pal account funded by an anonymous debit card to address the second limitation.
The second limitation may impact your intended use, but despite the card’s claimed limitation, I have successfully used them to pay recurring charges.
I imagine that this depends on how the merchant does their billing.