Amazon currently has a $2.50 coupon on Head & Shoulders shampoo and conditioner, which makes for some nice deals. 
The prices listed below are after the $2.50 coupon, which can be found right below the price on the product page..
- Head & Shoulders Damage Rescue Dandruff Conditioner 13.5-Ounce Bottle – $1.33
- Head & Shoulders Moisture Care Dandruff Co-Wash Conditioner – $1.33
- Head and Shoulders Full & Strong Dandruff Shampoo 13.5 Fl Oz – $1.79
- Men Old Spice Dandruff Shampoo 13.5 Fl Oz – $1.79
- Head & Shoulders Men Deep Clean Dandruff Shampoo 13.5 Fl Oz – $1.75
- Old Spice for Men 2-in-1 Dandruff Shampoo and Conditioner 13.5 Fl Oz – $1.99
- Head & Shoulders Dandruff Shampoo, Instant Relief, 12.8 Fluid Ounce – $1.99
- Men Total Care All-in-1 Dandruff Shampoo + Conditioner 13.5 Fl Oz – $1.99
Pack of 2Men Refresh 2-in-1 Dandruff Shampoo + Conditioner 13.5 Fl Oz – Just $2.59-$3.19 Shipped with Subscribe & Save.
Note that these are “Add-on Items” which only ship with an Amazon order of $25 or more.