Hi,
I'm in TX and I spent a lot of time online trying to find the answer to this same question. I did find it on one of the state dept. agriculture websites finally, and even then it was a bit hard to understand, but the way I interpreted it is that here in Texas, you can sell your eggs directly to the consumer without any kind of license, but you cannot sell to a reseller. So for example you can put up a sign and sell to neighbors or go to a flea market, but you cannot sell to a local grocery store for them to resell to their customers.
Also, you cannot sell in cartons that you saved from the grocery store that have another brand name/info on them. You should use blank cartons and mark the eggs "ungraded" and include contact info like address or website in case there is a problem.
If I can find the website again, I'll post the link.