Amazon offers the Zwipes Microfiber Cleaning Cloth 24-Pack for $9.88. Order via Subscribe & Save to cut the price to $8.40. With free shipping, that's the lowest total price we could find by $2, although most merchants charge $15 or more. These 12"x16" cloths purportedly absorb eight times their own weight.

Be sure to cancel Subscribe & Save once your order ships, or you'll be billed for subsequent shipments.