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 (107.99 USD): bgshOOp10
Coupon (110.99 USD): 7bcdf9
Coupon (111.59 USD): BGAFF7OFF
Coupon (111.59 USD): BGHCLE15
(CouponsFromChina.com tip: apply code in your basket (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): 15OFFDIBEAF6, 5719ed, ddfd6d, BGDB01, 10earth, 2019SPEDM, aff7off, BGHG522, BGDBC85, BGDBEF6, BGDF6, bGpAnDacHeCk, BGHOMEAPP, BGF6DES
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Dibea F6 Cordless Vacuum Cleaner.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).