A 3-month supply is almost always more expensive per dose than a 6-month or 8-month supply.

Usually has the lowest "per dose" price for a 3-pack or 8-pack. You do not always need to use their pharmacy; it’s often stocked in the pet aisle.

Visit the official Frontline website (Boehringer Ingelheim). They frequently offer "Buy 6, Get 2 Free" rebates that you can take to your vet or local shop.