I brought hatching eggs up from sea level (VA), and got about a 60% hatch, but I have heard from more than Mayah that big elevation changes for shipped fertile eggs create hatching issues. Apparently it has to do with air pressure changes. I already have an order from some folks in SW Washington, and will be sending extras to them because of the hatch rate issues. They live at 34 ft.
As Mayah said, buy local if you can, and either hatch them yourself or buy extra chicks from a local breeder.
I am now rethinking some of my breeder pullet options, now that it looks like Abraham (aka Mr, Pig) may end up being over SoP weight. Unless I can put hiom on a treadmill and a diet....... If he is overweight by March, I will go with a couple of smaller pullets so the offspring is smaller. Of course, those big meaty Dom roosters are SOOOOOO yummy......