If you're looking for an over-the-counter (OTC) medicine available without a prescription, Frontline Plus for Cats is your best bet. Before buying any flea treatment, ask your veterinarian which ...

But if you need this medicine for your cats, Costco could be a good place to buy it. At Costco.com, you'll pay $79.99 for eight doses of Frontline Plus for Cats (given once per month), or $10 each.