This may not be available at all stores- but today I found a nice Bonus Pack of Clairol Natural Instincts that includes a free Pantene Shampoo. It is not a chintzy little shampoo either- but a full size 12.6 oz Bottle. I turned one of the bonus packs around so you could see. The price points at my store were between $5.54 – $5.99 and I found these on a back side end-cap in the H&B section.
Buy 2 Clairol Natural Instincts Hair Color ($5.54 – $5.99 each)
-$5/2 Clairol Hair Color Products, Any – 03-07-10 PG
-$3/1 Clairol Natural Instincts 4-4-10 PG 4-4-10 PG
= as low as $2.54 – $2.99 for Hair Color and a full-size bottle of Pantene