Aliexpress
Click here… to search for Universal Long Flexible Gooseneck Arm Tablet/ Phone Holder on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (30.47 USD): Cuponation9
Coupon (30.80 USD): BG8ReviTrage
Coupon (31.47 USD): BG00c906
(CouponsFromChina.com tip: just apply this code 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): BG969E08, BG98bfe3, BGe7f4f6, BGbf4772, BG9a4d5b, BGAlerabat, 2022ACTIESNL, BG9e4ccb, BGPHholder, BG7e650e, hoNEYbGdeAlS, BGJUNEGSG9
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Universal Long Flexible Gooseneck Arm Tablet/ Phone Holder is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).