Walmart offers the Spectracide 32-oz. Weed Stop For Lawns Crabgrass Control for $5. 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 purportedly kills 470+ types of weeds with visible results in eight hours.
There are lots of things Uncle Sam can't touch — so long as you play by the rules.