Get this Duracell Powermat Phone-Charging Set with 2 Phone Cases for iPhone 4/4S or Galaxy S3 for $74.99 plus free shipping at Groupon Goods. This was the lowest price by about $5 and other offers did not include the second case which can cost as low as $23, making this the lowest price by $28. Powermats and wireless cases enable drop-and-charge functions on iPhones 4/4s and Galaxy smartphones. It is available in white or black (iPhone only for this color). Sales tax is charged in most states.