Frontline Plus the topical flea and tick preventative is currently offering a free dose with the purchase of a box of 3. Get 4 months of protection for the price of 3. If you think your pet would prefer an oral preventative, we carry Nexgard. It is a beef flavored chew equally as effective as the topical. If you purchase a box of 3, you pay for 2. Great deals on Great products.