Aliexpress
Click here… to search for Xiaomi 430ml OLED Insulated Water Bottle White on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (52.02 USD): BGHB218
(CouponsFromChina.com tip: you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): BGRU091, vipupgrade8, TTxBG10, BGKKF19, ML15%Pro, BGAB28, bgshOOp10, bGhOnEy10, BGHB20, BgoFErTaSchInA10, BGSD52469, BgcLuBofErtA10, 13f142, BGAFF10OFF, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, 6GSGIT, BGHealth06, BGHealth10D, 2022ACTIESNL
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi 430ml OLED Insulated Water Bottle White.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).