The RAVPower QI Fast Wireless Chargers for various Android and iOS devices is now $7.49 after discount (click "Redeem coupon" under the Applicable Promotions). This is a great price, even lower than the $9.99 deal from a few days ago.
You can also buy as many as you want for this price, but only in one order.
https://www.amazon.com/gp/product/B074K22MSN