Lowes offers the Bayer Advanced All-in-One Lawn Weed & Crabgrass Killer Ready-to-Spray 32-oz. Bottle for $6. Plus, MyLowe's members get free shipping. (Not a member? It's free to join.) That's the lowest price we could find by $5, although most stores charge $14 or more. It treats up to 5,000 square foot and kills over 200 broad leaf weeds. The Bayer Advanced All-in-One Lawn Weed & Crabgrass Killer Concentrate 32-oz. Bottle is also available for $6 with free shipping for members.