As lightchick said...start with corrid just in case. Cocci kills very fast. If it isn't that then it won't have hurt anything to have tried it. That is the most common killer of chicks.
Do I have to get this from my vet, or does anyone know a store to get this from? Our local farm stores don't carry this, but I can travel farther away. Unfortunately, this holiday weekend couldn't come to a quicker end.