That's really a bummer. Where I buy mine, he sells them all year, even in the winter time when there's snow on the ground. This time of year, he has several breeds. There's no limit of the number to buy. He makes sure your educated when starting out. The owner will take back any chick(rooster or hen boughten from his store) and either keep or exchange. He'll even order a breed I want. It's too bad your not near his store. He sells chickens at all ages too.
It took my husband and I a long time to find a chick store.
I do look on Craigslist and see a lot of people selling chicks. Barred rocks are easy to find.
Good luck. If you do end up buying chicks, you'll have to separate the barred rock by a wire divider. It will take about 3 weeks before you can integrate if all goes well. Your barred rock will not want to be alone. She'll drive you nuts with her peeping out. The wire divider might work. Usually you can take the divider out and integrate when they are the same size. Keep a close eye on them when you do this, you'll know right away if it will work at that specific time. Eventually they will get along.
Good luck rehoming the boys.