Save $4.00 on OxiClean dishwasher detergent at Walmart! Use a $4.00 coupon on the purchase of two bottles of OxiClean Extreme Power Crystals. They are $3.97, regular price. After the coupon, the price drops to only $1.97 each! Ironically, as I was in the store taking a picture of the product, I noticed a $2.00 peelie coupon attached to the bottles. Not all stores have this coupon, so be sure to print the coupon below, but keep your eye out for the peelie too.