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RAVPower takes 50% off sitewide via coupon code "WIRE5034". Plus, all orders receive free shipping. A couple of best bets, with prices after coupon:

RAVPower Qi-Certified 10W Wireless Charging Pad for $4 (pictured, low by $8)

RAVPower 6,700mAh Portable Battery Pack for $11 (low by $7)