I have never ordered from them either. I am pretty sure that you have to ask for them to be vaccinated and pay extra for it. The vaccine they usually offer is Marek's. However, if they are vaccinated and if I understand correctly, that will make them carriers for life. Infectious bronchitis is not usually offered.
I have never seen/heard of as many chicken diseases in my life as I have here. We moved here about 3 years ago. Mareks, IB, Fowl Pox and who knows what else. I either buy vaccinated or vaccinate myself for these as well as for Newcastle Disease (just because it comes in my IB vaccine).
After vaccinating with Mareks, you should sell only to people who keep a vaccinated flock otherwise it can cause Mareks in their own chickens. If you vaccinate or buy vaccinated you should only feed non-medicated chick starter for a while as it can cause the vaccine to not be as effective.