HI. It depends what vet you use as to whether they offer a cheaper treatment or not, and of course how knowledgeable you are on the problem, I'm sorry to say that most vets are all about money especially the larger concerns,We have used most of the vets in this area at some time or other and know the better ones, most dogs that come to us with Lieshmania are on Zolric 300mg which is the same as what your using, cheap and very affective.
Its great news about this vaccine and long awaited.
Terry.