To the OP- This isn' about egg prices, but a sense of propriety in work mate relationships, especially guys.
It seems likely that your husband doesn't want to confuse his relationships at work. Understandable. He should not feel he's stuck like pickle in the middle. He doesn't want to be "selling" his workmates, thus the deep discount to soothe his conscience. Understandable. He likely doesn't want to feel like he is hustling his workmates for "big bucks". That is fine.
Thus, consider leaving him out of your egg business. If his workmates wish to become egg customers, have them call you directly. That way he can deflect everything to you. He can merely be the delivery boy, if he wishes. That way his workmates are buying from YOU and not from him.
As a guy, this is how I might feel, if I were in his shoes.