Yup, I'm in the UK and our shops just ahve eggs on the shelves, not in the fridge section. As for how long an egg can keep and still be good to eat, well, I've kept eggs for over 5 weeks and they've still been fine. I've also incubated eggs that were over 3 weeks old and had good hatch rates from them.
It's pretty cold where I am though; even in the summer it rarely gets up to 22C (71F), so I think that must make a difference. If it was 80F+ I think I'd be putting my eating eggs into our fridge, and storing my hatching eggs in an adapted wine cooler fridge that would keep them at 55F, cause that's what's recommended for best hatchability.
It's pretty cold where I am though; even in the summer it rarely gets up to 22C (71F), so I think that must make a difference. If it was 80F+ I think I'd be putting my eating eggs into our fridge, and storing my hatching eggs in an adapted wine cooler fridge that would keep them at 55F, cause that's what's recommended for best hatchability.