Walgreens has the Purex 2x Laundry Detergent on sale for $1.99 with in ad coupon. If you find the kind that has Zout in it, you can use this $2 off Purex coupon to get it for free.
To get the coupon, go here to sign up for a free sample of Purex or get a $2 off coupon. You will have a choice after you fill out the form.
Thanks: The Frugal Find