I ship like Hangtown - I will say that if I had the $, I'd definitely DEFINITELY ship using preemie diapers rather than bubble wrap pouches. I've gotten a few shipments in them, and they are awesome. MUCH more padding than bubble wrap pouches, and so you don't even need to line the bottom, sides & top with large bubble wrap. Just wrap each egg in a diaper & pop it into the box. There is no space savings, though, as the diapers are thick. However, that's also adding more garbage to the landfills, which bothers me, and is one of the reasons (plus expense) that I don't do it. But, again, those were the VERY BEST wrapped eggs and I got a fantastic hatch from them. They're like miniature insulators for each individual egg!
I HATE shipped eggs in egg cartons. I've had a few customers specifcially request it, and I have done so if they want them that way, but I caution them that IMHO, it's not the best way to ship.
I got some eggs from a friend in Washington state just last week, and she works for a pharmaceutical supplier (or something along those lines...) - she shipped them in a miniature styrofoam cooler, individually wrapped inside. WOWZERS. Now THAT is some impressive packing if you ask me. BUt...again, more garbage for the landfills.