No one is going to ship fertile hatching eggs of a critically endangered variety overseas from the US. It's still very expensive because the parent flock has to be tested for a plethora of diseases and the vet bills are ridiculous. Furthermore, the chances of any of the eggs being viable and able to be hatched are practically zero. Again, if you are seriously wanting them, importing live birds is the only way it's going to happen. And it takes a lot of money to get them from point A to point B.
https://www.gov.ie/en/publication/72c8d-trading-in-animals-and-animal-products/
https://www.aphis.usda.gov/aphis/ou...r-animal-exports/CT_IRegs_Animal_Exports_Home
https://www.gov.ie/en/publication/72c8d-trading-in-animals-and-animal-products/
https://www.aphis.usda.gov/aphis/ou...r-animal-exports/CT_IRegs_Animal_Exports_Home