Amazon offers the Zwipes Microfiber Cleaning Cloth 36-Pack for $13.99. Add it to cart via Subscribe & Save to cut it to $11.89 and bag free shipping. That's tied with our mention from two weeks ago and about $2 less than what you'd expect to pay in your local store. (Many online retailers charge $23 or more.) These 12" x 16" cloths purportedly absorb eight times their own weight.
Be sure to cancel Subscribe & Save once your order ships to avoid being billed for subsequent shipments.