Ideal has a couple kinds you can choose from: All male CornishX or all male egg layer breeds. Since I didn't want the Cornish, I chose the egg layers. They said it would be a mix of breeds like White leghorns, BO's and others that have light colored chicks. Sometimes they offer ST Run Cornish X. I have looked and don't see any with the typical wide stance of the CornishX. These are injected before hatching to dye and I think they just send the females to the egg/meat farms if they don't have enough orders for them.
By the way, If any of them turn out to be BO's or White Leghorns they will go into the free range flock at work. If any DO turn out to be CornishX they will probably end up in the freezer (I had a C.X hen given to me that suddenly died after a few months and I had no clue why until I joined this group)and any of the others will be pets.