Amazon has the Advecta Ultra Flea And Tick Prevention Topical Drops (4 Month Supply for Large, Medium or Small Dogs) for $20 - 25% off coupon (check “Save an extra” box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel anytime) = $14 with free shipping on $35+ or with Prime (extra 10% off for 5+ subscribe and save orders).