I got mine from a local feed store. There was one EE pullet and an EE rooster in my original 8 chicks. Then one of my other hens went broody and hatched a solo chick - my very first GrandChick, the product of the EE rooster and EE hen. (It wasn't the BO's egg that hatched, but one of five eggs, one from each laying hen at the time.)
Then I started buying hatching eggs and incubating them myself. However, another hen went broody and hatched four chicks, two of which were EE/Delaware crosses. They each have the puffy cheeks and lay green eggs.
I continue to buy hatching eggs and incubate them. Occasionally I buy a chick or three from the feed store... depending on what hatches from the eggs I buy.