I have not had a chance to check and see if my Dollar General has this, but at some stores you can get Oxydol Detergent for $1.
$1 is not bad but free is better. You can grab a coupon for $1/1 Oxydol Detergent. Then take it to Dollar General and if your store has this you can grab it for Free.
Thanks,Saving With Vetta for the photo and deal!