You can get 420ml Titanium Hydrogen-Rich Water Bottle for $40.41 using coupon code (in Banggood). Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
Latest price update (UTC time):
Capacity 420ML, Operating voltage DC 5V 1A, Battery capacity 3.7V/1000mAh (Built in), H2 connentration 0.6-1.3PPM, Weight 396g, Charging time 2.5-3h, Operating time 3min, Size “Height: 290mm Cup bady diameter: 67mm”, Suitable for water temperature 20-60℃ room temperature, Material “Borosilicate glass + 304 stainless steel
+ Natural silicone ring”, Number of work (Fully charged) 15-20times, Reduction potential (ORP) 0~ -500MV, Power 4W, Operating mode Semi-automatic, Name Hydrogens-rich Water Cup
Banggood ($40.41)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. Price? Well, this price is higher than average price ($22.99)
Link: Banggood product page
Price: $40.41
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG906e7a, BGHUXC122, BGJUNEGSG9, BG9dce47, BG807727, BG9e56d3, Cuponation9, BG8ReviTrage, BGcoupon8off, BGGutscheine, BG00c906, BG8OFFCOUPON, TTBLACK5, BG5519a5, BG589b2e, BGf625a4, BGc4a05f, BG8FORMULAMX
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for 420ml Titanium Hydrogen-Rich Water Bottle? There we go.
Price records source(s): 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)).