Okay, so update - we went to the local Morrisons (another chain) over lunch and got 18 eggs (they are sold from trays that you box yourself, but we just took half a tray) for £5.40 (so, what? US$6.82) The eggs are sold by the egg too, 0.30 each, so we could have bought any number we wanted really. They are also free-range. Remember too, in Europe eggs don't need to be refrigerated because we don't treat then to remove the outer layer.

Europe vaccinates their chickens for salmonella I think (vs pasteurization in the states). They might be vaccinating them for bird flu as well, the USA just culls an entire flock if they find an infection in the flock.