Just check coupons out (with price alert and history). Do you want to know what the best price is?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Input: 5V 2A, 9V 1.67A, Output: 6W (max), Wireless transmission distance: 5mm
Price history and price alert
Check out price history chart (for all/most countries) for Qi Standard Wireless Charger.
Price records source(s): Gearbest
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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)).