I was hoping I'd have some duck, some muscovy and some buff brahma eggs to go with my maran eggs, but all 3 'suppliers' have now said they can't provide me with any

I guess I'm only going to have maran eggs for my NYD hatch. I don't know if I can get to my own eggs before the get too chilled so it's doubtful I will be able to provide any of my own. How do I store fertilized eggs, prior to the set date?
Store them in a cool dark place, pointy end down either in an egg carton or an auto egg turner. I like to turn them several types a day to keep the air cell from sticking to the inside of the egg.