Home Depot cuts 60% off a selection of 3M Filtrete Filters, with prices starting at $4.97. That's tied with our mention from a week ago as the best sale we've seen for these filters, yielding a number of price lows. Shipping starts at $5.99, although select items qualify for free shipping. (Many items are also available for in-store pickup; some only have this option.) Deal ends October 4.

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A couple of best bets, each with free shipping:
- Filtrete 20" x 20" FPR 9 Purple Pleated Air Filter 12-Pack for $76.66
- Filtrete 14" x 25" FPR 10 Ultimate Blue Pleated Air Filter 6-Pack (pictured) for $47.93