Good experience from Sears earlier this week. I was looking for a bacteriostat to treat the water in my humidifier. The parts list for the humidifier offered a quart for about 7 dollars plus about the same amount for shipping. Got a quart at Sears for $3.99. That is enough for about two and a half months.
By the way, any of you who use an evaporative type humidifier--you should be adding a liquid bacteriostat to the water placed in that equipment. Humidifiers can support the Legionella bacteria, which cause a very serious form of pneumonia. I have been told that using 8 drops of Clorox per gallon is an adequate preventive, but as cheap as the bacteriostat is, I believe I will stick with it.