I vaccinated against 5 diseases, but I forgot which ones.....it is written down in my log however. I was mainly concerned about fowl-pox, but I am not completely convinced that that was what killed almost every chicken in Cut Off about 12 years ago.....thats just what got the credit.
Considering that the main cost of the vaccines was the shipping and that you can vaccinate 1,000 birds with each, I just ordered a variety of vaccines and waited a certain time period between each and followed the instructions to the best of my ability. The fowl-pox was the hardest, due to the sticking.
Total cost was about 86.00, but, like I said, that was for 5 different diseases. Small price to pay to not see my whole flock die a yucky death.