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 (192.29 USD): BGeaf456
Coupon (196.57 USD): BG8ReviTrage
Coupon (200.84 USD): BG00c906
(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): BGHOMEA13, BGCZDREVMAX, BGHU0355, BGHU0377, BGCZDRVCMX, BGCNDVCMA, pROMo8cuPoN, BGHAP13, Cuponation9, 9OFFSUMMER, BGAHPU13, BgGoodie9
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Deerma VC01 Max Vacuum Cleaner is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).