Walmart offers the Spectracide 128-oz. Weed & Grass Killer for $4.80. (Kmart offers it for pennies more). Opt for in-store pickup to dodge the $5.99 shipping charge. That's tied with last week's mention and the lowest price we could find by $4. It kills over 155 types of weeds, including chickweed, plantain, annual bluegrass, dandelions, and clover.