Amazon offers offers the Clif Energy Bar 2.4-oz. 12-Pack in White Chocolate Macadamia for $8.99. Add it to your cart via Subscribe & Save to drop it to $8.54 and grab free shipping. That's $0.71/bar and about $1 under the price you'd expect to pay at your local store, although we saw them in a different flavor for a buck less last month.
Be sure to cancel Subscribe & Save after your order ships or you'll be billed for subsequent shipments.