@drmama Oh boy! I remember when my 4 boys started crowing in synchronicity one morning. They were moved quick-smart to a quieter part of the property and have been happy in their little flock ever since.
As for what you can do? It's a tough one. You need to come to terms with the fact that as soon as you part ways with them, you have no control over their future. Whether they're used for breeding stock, feeding stock, or can live out the rest of their days in a backyard flock is something that's near impossible for you to control, especially as you're in a hurry to get rid of them.
If you list them for free, the chances are much higher they'll end up on the dinner table. If you list them for money, the chances of moving them quickly are reduced. If they're a rare breed, you may be able to sell them for breeding stock, but as they're from a classroom hatching program, that seems unlikely. What breed are they?
The only way you can control that fate is to euthanise them in a humane way. One of the local breeders here euthanises all her ex-breeding roosters through a local avian vet. Painless and quiet, and she feels that they give her so much of themselves that it's the best way for them to leave this world.