I can tell you how I received eggs from bargain. Each egg was wrapped in bubble wrap, and packed into a box snugly with popcorn, bubble wrap and misc styrofoam. And there was a foamy padding on the bottom of the box. She then put that box in a larger box and padded it.
The eggs made it all unbroken from GA to CA. They are in the incubator right now. (Day 6)