Aliexpress
Click here… to search for HOCO Z3 Dual Car Charger 3.1A on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (6.02 USD): AFfbG10
(CouponsFromChina.com tip: apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 502C6B, TTxBG10, 2019SPEDM, BG3CSUM, bgssaff9
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for HOCO Z3 Dual Car Charger 3.1A.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).