$0.40 for a dozen eggs???

I know I live in a pretty bourgeois area and I only ever buy the locally sourced, free-range, happy-hen eggs, but it cost me £5.50 for a 12 large eggs a week ago! Don't get me wrong, I'm perfectly happy to pay that for produce that comes from humanely raised animals, so I'm not complaining about the cost. I just can't imagine what kind of huge, industrial size battery farm would have to be producing each day, in order to sell a dozen eggs for 40 cents!!!