Hello and welcome to BYC, You found an Awesome poultry Forum to be a part of with many great knowledgeable members who are more then willing to jump in and help you with any questions you may have.
Welcome to BYC ! Good luck with your search ! ebay has a lot for sale at this very moment . But a couple are priced to high in my opinion , There are many others. Hope this helps .
Unfortunately it's getting to the end of the breeding season for emus so the eggs are going to be harder to find. Late season eggs also have a higher infertility rate, so keep that in mind.
That said, I would check Facebook. There are several emu groups with breeders who sell eggs.