Aliexpress
Click here… to search for Xiaomi CARFOOK Gravity Air Vent Phone Holder on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (16.19 USD): BGAFF10OFF
Coupon (16.19 USD): bGhOnEy10
Coupon (16.19 USD): BGdragonBoat
Coupon (16.99 USD): 13f142
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): BGxmch05, TTxBG10, BGCFXM99, BGXMHD89, aff7off, BGXMHD79, BG3CSUM, BGkejkwk, bgssaff9, AFfbG10, BGCAR12, 15holders, BGCARFOOK7, Holder10, BGVDay10%off, BGSS10%SW
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for Xiaomi CARFOOK Gravity Air Vent Phone Holder is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).