Amazon has the 20-Ct Swiffer Sweeper Heavy Duty Wet Mopping Cloths Multi Surface Refills for $10.99. Select "one-time purchase" option and clip the $1.70 off coupon, then select Subscribe & Save option for $10.44 - 20% off coupon (check “Save an extra” box, eligible on first S&S order for this product) = $6.54 with free shipping on $35+ or with Prime.