Someone out here should be able to point you in the right directionfor SC. Or for the skinny from the source visit your state department of ag page.
Here in Montana we small folks are exempt from licensing... this is directly from our department of ag page about licensing!!
A person buying, selling, or dealing in eggs, a major portion of which are produced by the person's own fowl, or in amounts less than an average of 25 cases per month, is exempt from the requirements of this section.
So if you are doing a few dozen or even a small farmers market you are ok in Montana.