The vaccine normally runs about $35/strain and there are three different strains. If you don't know what strain is in your area, you have to use all three as there is no cross protection. That's for 100 doses. However, the vaccine has not been available the past two years. If I remember correctly, this particular company was going to charge like $1500 for 1000 doses. Not sure if that was a single strain or all three.