Amazon offers the Windex Flat Pack Wipe 28-Count 3-Pack (84 wipes total) for $5.40 with free shipping via the steps below. That's around $4 less than you'd pay in local stores. To get this deal:
  1. View the Windex Flat Pack Wipe 28-Count 3-Pack for $7.20
  2. clip the 20% off coupon
  3. check out via Subscribe & Save for a final of $5.40
Be sure to cancel your subscription once your order ships to avoid being billed for further shipments.