Their front line is so much cheaper than Petsmart! And they let you buy just one months worth at a time instead of having to buy three months worth! However every three months worth you buy you get one months worth free!!!!! Great deal! Also the woman at the front desk let us know if after three months in a row of using frontline we still have tick or flea problems we can contact frontline and they will personally come out and have your property sprayed!:) that was nice to know!