Amazon has the Amazon Brand Solimo Flea and Tick Treatment for Dogs (6 Doses, XLarge Breeds, 89 to 132lbs) for $16.35 - 5% off with Subscribe & Save (can cancel anytime) = $15.53 with free shipping on $25+ or with Prime. Treatment for other breed sizes are about the same price.

• Also qualifies for the 20% off $50 promo for Prime members