Amazon offers the Mucinex DM 12-Hour Expectorant and Cough Suppressant Tablets 40-Count Box for $11.08 with free shipping via the directions below. That's about $9 less than what you'd pay at a local store. To get this price:

1. View the Mucinex DM 12-Hour Expectorant and Cough Suppressant Tablets 40-Count for $17.05
2. clip the 30% off coupon on the item page
3. checkout via Subscribe & Save for a final price of $11.08

Be sure to cancel Subscribe & Save once your order ships to avoid being billed for subsequent shipments.