Here is a great coupon for $1/1 Wisk Laundry Detergent Coupon. This coupon is good on any 45oz or larger.
Wisk Detergent $4.99
$2/1 Wisk Laundry Detergent, exp. 5/6/12 (RP 03/25/12)
or use $1/1 Wish Laundry Detergent
$2.99 after coupon
Click here to see an All Detergent deal at Giant/Martins or Walgreens