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AnkerDirect [amazon.com] via Amazon has Anker PowerWave 7.5W/10W Max Wireless Charger (No AC Adapter Included) Black color for $ 8.49 (No coupon needed).

Shipping is free w/ Prime or on orders of $ 25 or more.
Make sure the seller is AnkerDirect and it says "Sold by AnkerDirect" below the "Buy Now" button to see this price

Deal Editor’s Notes & Price Research:
Includes a 4′ Micro USB Cable + 18-Month warranty.
Features 10W Fast Charge Mode or 7.5W Fast Charge Mode: (Using QC 2.0/3.0 Adapter), 5W Standard Charge Mode: (Using 5V/2A Adapter). Compatible with Qi-enabled phones and devices.