Amazon offers Prime members the 3M Indoor 5-Window Insulator Kit, model no. 2141BW-6, for $11.65 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.74.) That's tied with our mention from a month ago as the lowest total upfront price we've seen. (It's the best deal today by $7.) It includes materials to insulate five 3x5-foot windows.
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