Skip to main content

Finding the cheapest place to buy depends largely on whether you prioritize bulk discounts, subscription savings, or immediate local availability. As of April 2026, Walmart often leads for small-quantity purchases, while Chewy and Petco offer significant savings through first-time subscription "Autoship" deals . Top Retailers for K9 Advantix II

: Frequently offers some of the lowest "out-the-door" prices for smaller packs. For instance, a 2-month supply for large dogs (21–55 lbs) has been found for around $14.98 .

: Competes closely with Chewy, offering similar 6-month pack prices of $79.99 (regularly $84.99). They also offer a 40% discount on the first "Repeat Delivery" for select flea and tick items.