Fixed Position Air Vent/Outlet, Color Black, Packge included 1*Car Phone Holder, Feature Gravity Linkage Auto Lock / Multi-angle Rotation / One-hand Operation, Compatibility For Most Smart Phones 4.7-6.5 inches, Material Aluminum Alloy + ABS, Silver.
Basically copy coupon, view price history or create e-mail price alert. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($16.19): BGAFF10OFF
2. ($16.19): bGhOnEy10
3. ($16.19): BGdragonBoat
4. ($16.99): 13f142
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGxmch05, TTxBG10, BGCFXM99, BGXMHD89, aff7off, BGXMHD79, BG3CSUM, BGkejkwk, bgssaff9, AFfbG10, BGCAR12, 15holders, BGCARFOOK7, Holder10, BGVDay10%off, BGSS10%SW
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi CARFOOK Gravity Air Vent Phone Holder. The lowest price was: $6.99.
Price records source(s): Banggood
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)).