VF1500, Capacity: 1500ml.
Basically copy coupon, view price history or create e-mail price alert. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($49.54): bGhOnEy10
2. ($49.54): BGdragonBoat
3. ($49.54): BGAFF10OFF
4. ($49.54): BGHOMEA15%
5. ($49.54): BgcLuBofErtA10
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): AFfbG10, BGGR377, BGBTV29, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BGHOMEG12, BGMPB2020, BGSS10%SW, bgshOOp10, BGHome15%
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi VIOMI VF1500 Vacuum Flask. The lowest price was: $22.89.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).