Today only, Soap.com cuts 40% off a selection of Duracell myGrid wireless power accessories via coupon code "MYGRIDFLASH". That's the best deal on these items we've seen, as it yields several price lows. Orders over $39 receive free shipping; otherwise, shipping adds $4.99. (For new customers, that minimum drops to $25.)

A best bet is the Duracell myGrid Power Sleeve for BlackBerry Curve 8300 (pictured) for $19.31 after the above coupon. With $4.99 for shipping, that's the lowest total price we could find by $39. This case allows your Blackberry 8300 to wirelessly charge on a Duracell myGrid mat.