Best Buy offers the Insignia Qi Mini Wireless Charging Mat, model no. NS-MWPC1W, for $14.99 with free 2-day shipping. That's $15 off list and the lowest total price we could find. (For further comparison, we saw an open-box one for just a buck less in August; this one is a new, factory-sealed unit.) It charges compatible Samsung Galaxy smartphones and other Qi-compatible devices, and features a blue LED to indicate charging status.

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Orders placed by 11:30 am ET on December 21 are expected to arrive by Christmas.