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 (20.18 USD): 8wEbgaInS5
Coupon (20.18 USD): pROMo8cuPoN
Coupon (20.39 USD): 2203ActiesNL
(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): AFfbG10, BGVDay10%off, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGEBSC15, BGCuponation10, 13f142, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGBICYCLES, BG4d9120, 00c906, 8BGwbg2204
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for GUB Pro3 Bicycle Phone Holder? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).