Aliexpress
Click here… to search for Xiaomi HUOHOU Vacuum Bottle Stopper on 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 (13.95 USD): Terence
Coupon (14.10 USD): BG00c906
(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): BGMS79K, AFfbG10, BGVDay10%off, BGHOMEG12, BGstpp25, 13f142, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGHome15%, BGHOMEA15%, BGNOFR185, BgcLuBofErtA10, BGJATD185, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGZXJU185, BG10OFFAFF1, BANGGOODSD, BGAlerabat1
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi HUOHOU Vacuum Bottle Stopper? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).