Amazon offers its Prime members the Norpro 16" x 18" Microfiber Dish Drying Mat in Gray or Cream for $6.62 with free shipping. (Black is available for 15 cents more. Non-members can spend $35 to qualify for free shipping; otherwise, it adds $6.25.) Outside of the mentions below, that's the lowest total price we could find by $11. It absorbs up to four times its weight in water and is machine-washable.