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Prices for heartworm meds change all the time. There is no one site that will be the cheapest every month. 1-800-PET-MEDS is usually one of the more expensive sites.
I don't know if any of you that use Revolution are open to another opinion, but I very strongly discourage the use of Revolution. In my experience, it is not as safe or effective as any of the ORAL heartworm prevention. It does nothing for hookworms, roundworms, or whip worms, some of which are transmittable to people from dogs and are microscopic. These intestinal worms are easily picked up by dogs on walks or at the dogpark.
It does treat for ear mites and demodex mange... but why treat for those when you know that your dog does not have them?
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