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Amazon [amazon.com] has 1-Gallon Spectracide Ready-to-Use Weed & Grass Killer on sale for $6.24. Shipping is free w/ Prime or on $35+.

Walmart [walmart.com] also has 1-Gallon Spectracide Ready-to-Use Weed & Grass Killer on sale for $6.24. Shipping is free w/ Walmart+ (free trial available [walmart.com]) or on orders $35+.