Humixx-US via Amazon offers its Humixx Faux-Leather 10-watt Qi Wireless Charging Pad in Black for $19.99. Coupon code "4586AXZL" cuts that to $10.99. Plus, Prime members receive free shipping. That's the lowest price we could find by $3. It features 10-watt fast charging and 5-watt standard charging. Deal ends June 30.