I saw Mrs. Wages at the Walmart in Federal Way a week or so ago, back along the main aisle that runs between the section that has towels/bedding and the section that has lighting fixtures, bathroom shelves and that sort of thing.
I called WalMart at Lynwood and they told me that the one at Federal Way is "super walmart" so it carries many things that regular walmart stores do not carry.
Finally I gave up and ordered online. The address is http://store.yahoo.com/mrswages/mrswagpiclim.html. 1.85$ per pound, I ordered 20 pounds with shipping fee 7$, total is 44$, not bad at all, I guess I can use it for 5 years.