Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (24.74 USD): BG10OFFAFF1
(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): BGXD29, BGXmund10, BGOD1, BGTU923, AFfbG10, BGIS966, BGD11XS, BGBFAFF2019, BGH5966, 25Xmund, BGH5966D, BGCITYADS2019, BGXU142, bGpAnDacHeCk, BGXS152, BGTS204, BGMPB2020, BGAFF10OFF, bGhOnEy10, BGSUMMER7, BGUMBRELLA3, BGRIAN3, BGHOTSALE1, BGTRIP01, BGUMBRELLA11, BGEEXDHK11, BGHOMEA15%, BGHU0127, BGFX353, BGH5B02, BGSHHA
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Xmund XD-HK6 Automatic Umbrella is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).