If you are wanting to vaccinate against PMV, you will want to use the PMV vaccine that was developed by  Drs. John Kazmierczak and Paul Miller. I don't think that the Lasota vaccine was ever tested or proven to be effective against PMV in pigeons (it's for the Newcastle disease in chickens). I'm sure that Foys pigeon supply, or Siegals, or Jedds carries it. I haven't looked at the price, but the paratyphoid vaccine used to be around 130 dollars... I'm assuming that the PMV one is roughly the same. If they don't have it in stock, you could always call the West Trenton animal hospital in NJ and ask for Dr. K (it's what most everyone calls him). He's a great guy and would probably be able to get you the vaccine if the supply places are out of it.