I had not considered calling around to the different vets for their prices of frontline. I hadn't really thought about talking to my vet either. She is really good to me in the fact that when I bring my guys in for anything, routine or emergent, she never charges me an office visit, I only pay for shots and/or medicine. I should talk to her and see if she would be willing to sell me the Frontline at a discount. She knows how many I colonies I am caring for and that I paying for the spaying and neutering of them myself. I do have my colony cats spayed through one of the local cat rescue organizations, much cheaper than my vet, but they use Revolution. I did buy revolution through them last year, but one of my colony males got sick from a tick bite and I don't want to go through that again. Thanks for the suggestion and getting my pea brain thinking.