Cube Car QI Wireless Charging Holder (Banggood, Aliexpress: Frequency: 100-200KHz, Input: DC5V-1500mA, Wireless transmission distance: 4-10mm (the best price with coupon)).
Just check coupons out (with price alert and history). What is the best price?
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Price history and price alert
Here is price history (for all/most countries) for Cube Car QI Wireless Charging Holder. The lowest price was: $5.99.
Price records source(s): Gearbest
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).