I was thinking about that too, but I really have no idea, it's not like they even get a lot place in the shelf, usually I only see like at most 4-6 of those stocked.
The last time I saw them was in Switzerland, but I'm sure they are here somewhere too.
I remember seeing a vending machine with them, that's freaking disgusting too.
It's awkward too considering that most supermarkets here have a bakery, where you can get really good shit.
Back when I went to school people usually went there in their free time in between hours and got I nice cheesybun with eggs, ham, salad and remoulade sauce etc.
I really don't know how these things survive/can still exist.