Amazon.com : Spectracide Weed & Grass Killer Concentrate, Use On Driveways, Walkways and Around Trees & Flower Beds, 64 fl Ounce & Southern Ag Surfactant for Herbicides Non-Ionic, 16oz, 1 Pint :
FarmWorks 1 gal. 41% Glyphosate Grass and Weed Killer Concentrate at Tractor Supply Co.
Amazon.com : PureGro Weed Crush Weed Killer Herbicide Concentrate - All Natural Weed Killer Concentrate & Pet Safe Weed Killer - Non-Synthetic & Fast Acting - Safe for Kids & Pets (16oz) :