Hi Willkatdawson! I too have bee looking for standard sized Partridge Cochin eggs. I have found some on eggbid and ebay but their quality is unknown. I would rather find someone from here but, so far, no luck. Perhaps this post will bring forth a source.
PM KristenH on here. she had a whole flock of partridge cochins that she has been selllng eggs from. I know she was trying to sell the whole flock, not sure if she did or not.
I will have some this summer. I have 3 Hens and a Rooster, they are still young but one hen is starting to lay.
Mine are Non Hatchery and really nice. I will also have them in Bantam.
I should have some come later in the spring, they are laying now but I have not seperated my large fowl yet. still working on getting all the bantams hatching.