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Walgreens offers a selection of Tide 37-oz. and 40-oz. Detergent for $4.95. Clip the $2 off coupon on the product page to cut the price to $2.95. (Other products on this page have the coupon as well.) Opt for in-store pickup to dodge the $5.99 shipping fee. That's the lowest price we could find by at least $2. (We saw some varieties for a buck less last June.)