Over the last few years they've got harder and harder to find in supermarkets. Yes I know they're seasonal, but even in season I can't find them! All I can get are "baby potatoes" which are just the small ones of chewy skinned bog standard old potatoes, and Jersey Royals which cost £££.
I used to love thin skinned tasty new potatoes with a bit of butter 😔
(I don't have a local greengrocer to go and look in, there's a fruit and veg shop but it has a very limited range, half the stuff is prepacked and everything I've bought from there was no fresher or more exciting than what I'd get in Lidl!)