On the stretch of road that I live on there are three farms within a few miles that sell potatoes, lambs and eggs. I live closest to the egg farm and they have a fridge at the gate of the farm with trays of eggs and an honesty box beside it. A tray of 30 medium or 24 large egg is €5. Just help yourself to the eggs and slot your money into the box. I like this for so many reasons.
Incidentally, the farm is free range and organic so although we had intended on keeping chickens once we had moved out to the country there hardly seems to be any point when there are about 3,000 next door.