Xiaomi Honeywell JQJCY01YM Formaldehyde Monitor (Banggood, Aliexpress: Formaldehyde Over Standard Display YES, Data Storage, 0-1.5mg/m3, 0.01mg/m3, A Standard Atmospheric Pressure, CMIIT ID 2018DP5390, 1.5 Months, Display OLED, Range, Wireless Connection, Working Environment, Working Temperature 0-40℃, Working Humidity, Power Supply 2x AA Batteries, 15%-90% RH, Reading Resolution, Bluetooth 4.2 (the best price with coupon)).
Check coupons or create price alert down below. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
1. ($72.98): BGBF20off2
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): vipupgrade8, TTxBG10, 2019SPEDM, BGss506, AFfbG10, affbg10, BGBFAFF2019, BGCITYADS2019, BGHOMEG12, BGAFF10OFF, bGhOnEy10, BGSS10%SW, bgshOOp10, BGHome15%, BGHOMEA15%, BgcLuBofErtA10, BGCuponation10, 13f142, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Honeywell JQJCY01YM Formaldehyde Monitor. The lowest price was: $52.79.
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)).