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Sears has Windex wipers on sale. It appears that all of the Windex blades are on sale across the site. However, some of the cheaper sizes and prices are listed below:

Example: http://www.sears.com/windex/p-02803667000P

WINDEX DISTINCT WIPER BLADES (Official Info) [winplus.com]
Windex Distinct 12" 12 IN – $ 2.24
Windex Distinct 13" 13 IN – $ 1.99
Windex Distinct 14" 14 IN – $ 1.99
Windex Distinct 15" 15 IN – $ 1.99
Windex Distinct 16" 16 IN – $ 1.99