With orders of $25 or more, Amazon again offers the Pantene Pro-V Color Revival Shine 2-in-1 Shampoo & Conditioner 12.6-oz. Bottle 2-Pack for $8.98. Clip the $5 off coupon on the product page to drop it to $3.98. Plus, Amazon Prime members receive free shipping. (Non-members can spend $35 or more to qualify for free shipping.) That's tied with our mention from December and the lowest total price we could find by $4.
Note that this item is offered as part of Amazon's "add-on program" and can only be purchased with an order of $25 or more.