Amazon offers the Aussie Total Miracle Collection 7N1 Dry Shampoo 4.9-oz. Bottle 3-Pack for $10.41. Clip the $3 off coupon on the product page to drop it to $7.41. Plus, Prime members bag free shipping. That's $3 under what you'd expect to pay in local stores.

Update: Note that this item is temporarily out of stock, but can still be ordered at this price for delivery when available.