Product review (5 stars): Be smart and get more of these than you need!
These humidifier pads do just what they were meant to do, but the 5-star rating is for the availability and price.  I used to get these from a local heating and cooling retail business, but they really didn't want to sell directly to the public.  Once I found these on Amazon at a price that was less than I was paying before, I about did a back flip!  Buy enough so you don't have to pay for shipping and enjoy the savings!