Oats are expensive food in much of Europe apparently
well the stuff for humans is. Son1's GF stashes bags of oats into her luggage to take home to her mum in Italy when she goes to visit. There what we think of the breakfast staple is sold in delicatessens
In the UK and Ireland they're ubiquitous. Every supermarket has it's own brands as well as the big named ones.
There's another food we don't hear of much now, but still enjoyed. Peasemeal. Himself likes it but there's only one mill in Scotland making it now. I just make it at home for him.
Very, very nutritious and both peasemeal and brose, and carlins (fried peas) were very much staple foods in N. Europe. Grown from field beans that cropped well here, and added nitrogen to the soils too where they grew.
If you want to try it, then buy the split yellow peas for Chana Dahl. Roast the peas, let them cool and then grind in a mill or coffee grinder.
M