Hi.
I saw a thread yesterday for what it takes to get NPIP certified in your state. Many have already posted rules for their state. Usually the cost is low around $50. May depend on the size of your flock.
Though I am not sure, I believe the benefits of NPIP are worth while. Especially if you are planning to sell chicks.
Through a search, I saw the thread I was actually talking about was just for egg selling regulations.
I know if you contact your local ag commissioner they can probably give you great information.
1 pro is being able to sell across state and county lines.
a con I know of for some people is only being allowed to by from other NPIP certified people and having to dispose of your deceased in a very specific manor which I believe does not include disposing of the remains in the trash. Usually either burial or burning.
I believe NPIP is a responsible thing to do and should actually make buying and selling feel a bit more secure.
I will probably pursue it here in CA by next spring as I also wish to sell a little to cover my feed cost.
Good luck!