Your best bet is to ask people in your area who have gotten shipped eggs about their experiences. What works for someone in one area might not work for another area. Case in point, I know (after 2 years of getting shipped eggs) that I don't want to get eggs anywhere south of where I'm located. The reason for this is that they just don't hatch. It doesn't matter what species or breed they are, if they come from south of me I might as well just toss them in the trash. Now, this isn't always the case, I did get 17 of 37 serama eggs hatch that came from GA, which very much surprised me especially since the seller said that her eggs don't handle shipping very well. Usually I'm lucky to get 1 chick from a dozen eggs that come from my south, and more than once I've had 0% hatches from eggs as close as TN (I'm in KY).
Also, you have to take into consideration the breed or species you are wanting, some breeds handle shipping better than others. Silkies are one that don't take shipping well, at least in my experience. On the other hand, coturnix quail could probably go through a holocaust and still hatch. It's a lot of trial-and-error, but if you have someone local that can help you with determining what areas of the country are good for someone in your area to have eggs shipped from, that would help you a lot.
You also need to make sure that you have a good incubator and a good hygrometer/thermometer. Losing a lot of shipped eggs because your temperature is off really stinks!