Aliexpress
Click here… to search for ROCK Metal Gravity Car Holder on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
Coupon (12.99 USD): bGhOnEy10
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BGROCK10, TTxBG10, aff7off, BG3CSUM, bgssaff9, AFfbG10, 15holders, 502C6B
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for ROCK Metal Gravity Car Holder.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).