$15.99 – Brand Xiaomi.
Right now the best price with coupon code for Xiaomi Mijia 350ml Thermos is $15.99 (in Banggood). Just check coupons out (with price alert and history). You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood ($15.99)
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood. Low/high price? This price is higher than average price ($12.13) for this item.
Link: Banggood product page
Price: $15.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGD22859, BGKTMJ13, AFfbG10, BGCUP1199, BG13thMI20, BGDQ15, BGXM859, BGD11C03, BGD22859H5, BGXM129, BGIL231, BG4BTLRA, BGZ2859, BGBW514, BGBTTRA, BGCAMP01, BGSEPSE409, BGHome15%, BGOC407, bGhOnEy10, BGOCTD407, BgcLuBofErtA10, BGHOMEA15%, BGRMJWB350ML, BGNOFR407, BGNOF407, BGELEHOME39, 13f142, BGAFF10OFF, DEFEFO407, BGTHFR407, BGCuponation10, BGMASE407, BGMRDC66, BGAPTD407, BGHONEY2110, BGAPFO407, BGAPSX407, BG10OFFAFF, BGMAYSE407, BGMAYTD407, BGAPSX4073, BGwhielabel, BGJUTD407, BGisly407, BGPDhome63, BG10OFFAFF1, BGSPHOME48, BGTY109AF, BGTY101B, BG0faeee, BG69193e, BGBWITHUS859, BG4d9120, BGTYOT407, BGUdb59, BGAlerabatod, BG1aecd4, BGTYOI407, 00c906, BG00c906, BG4283e5, BG7280ff, BG36e006, BGeb3f38, BG9b8951, BG2bb7a1, BG5d2ea4, BG8ReviTrage, Cuponation9, BG5efbac
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
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Price history and price alert
Here is price history (for all/most countries) for Xiaomi Mijia 350ml Thermos. The lowest price was: $11.99.
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)).