Amazon has got a three pack of Resolve Laundry Stain Remover 30oz bottles marked down to $9.15, plus there is a $2 off coupon available that will bring them down to $7.15. That works out to be $2.38 per bottle.
Shipping is free on orders over $25 or more or with an Amazon Prime membership.
Please keep in mind that Amazon prices can change at any time, so you will want to verify the price before you purchase. If you do not shop with coupons at the grocery store, Amazon can be a great way to save on household items like this!
(Thanks Free Snatcher!)