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Walmart [walmart.com] has 40-Oz Spectracide Weed Stop for Lawns + Crabgrass Killer Concentrate on sale for $ 4.15. Shipping is free with Walmart+ or $ 35+ orders.
40-Oz Spectracide Weed Stop for Lawns + Crabgrass Killer Concentrate $4.15 + Free S&H w/ Walmart+ or $35+