UPDATE: The hens did not look any better today. So I went to the vet for some ADVICE. And the next thing I know they ring up 30$ for FIFTEEN doses of medicine. That is enough for 5 days for the 3 hens. Seriously? Anyways, i'm sure the shots will take care of the problem.
1) Do not by chickens that are kept in an unclean and crowded environment, they are probably sick.
2) DONT GO TO THE VET REGARDING CHICKENS.
Surely I could've got an entire bottle of medicine to inject for a better price, right?