Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (19.10 USD): Cuponation9
Coupon (19.31 USD): BG8ReviTrage
(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): BG8c7c89, BG48cca1, BGfcf83d, BGd24878, BG0a2f74, BGAlerabat1, BG230d89, Terence, Tabby20, 2203ActiesNL, BG1efeb0, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG751b82, BGJUNEGSG9, BGc7e1ef, BGb0022a, 9OFFSUMMER
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Automatic Folding Umbrella with Light 100cm.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).