Amazon offers the Tide Pods HE Turbo Laundry Detergent 81-Count Pack in Original Scent for $13.80 with free shipping, via the directions below. That's the lowest price we could find by $7. To get this price:

1. View the Tide Pods HE Turbo Laundry Detergent 81-Count Pack for $19.79
2. clip the $5 off coupon on the item page
3. checkout via Subscribe & Save for a final price of $13.80

Of note, it's also available in Ocean Mist for a few cents more via the directions above. Also, be sure to cancel Subscribe & Save once your order ships to avoid being billed for subsequent shipments.