Buying eggs on ebay is always a crap-shoot. There are reputable breeders who list on there but I wouldn't expect anything 'great' from ebay eggs.
If you don't see any listings on the BYC auction thread for the breed(s) you're looking for, search through the archives or even through the forum for people who breed the types you are looking for. Many of them have eggs to sell, they just don't advertise them on here or not when you are looking
Also, check with breed clubs, especially if you are looking for birds to show. You'd have a much better chance of getting 'quality' eggs if you go through a breed club.
If you don't see any listings on the BYC auction thread for the breed(s) you're looking for, search through the archives or even through the forum for people who breed the types you are looking for. Many of them have eggs to sell, they just don't advertise them on here or not when you are looking

Also, check with breed clubs, especially if you are looking for birds to show. You'd have a much better chance of getting 'quality' eggs if you go through a breed club.