Hi Linda, I didn't have mine vaccinated and one of my roosters came down with what I believe was Marek's disease.  He was very very sick, couldn't stand, had dark almost black/green stool and I thought he was going to die.  I took him to a vet here and she wasn't sure exactly what it was.  The only way to test for Marek's is to have them tested AFTER they have died (or they've been euthanized).  He gradually got better and is alive but he does have some balance problems still.  I know the flock has been exposed to whatever it was but they are all doing fine (it's been about 9 months since he was sick).  Anyway, I think it would have been so much better knowing what it wasn't by having the vaccination.  In our state (Massachusetts) it is so hard to actually be able to claim "organic" eggs, you have to jump through hoops!  Even if you feed them organic chicken feed you can't claim that they are organic unless every single thing you give them is certified "organic".  That means any scraps from the kitchen, chicken scratch, etc., and you have to have your place inspected by the state on a regular basis from what I understand.  So I do feed mine organic feed or "natural" feed because I feel better doing so but I also give them scraps from my (not organic) kitchen.  I don't sell my eggs, I give them to family and friends and everyone agrees that they are awesome!  Just my opinion but if I were to do it over I would get them vaccinated.