Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Outdoor Unit Dimension: 88.5x 23.8x 42mm, Size Indoor Unit Dimension: 134.3x 91.3x 24.2mm, Weight Outdoor Unit Weight: 57g, Sleep Current <30uA, Temperature Test Tolerance ±2.0℃, Model WP6850, Temperature Test Range 0℃~50℃(32℉~122℉), Transmission Distance 50m, Test Period 1 Minute, Batteries 2x AAA Batteries(Not Included), Input DC5V/ 1A, Indoor Unit Weight: 163g, Transmission Frequency 2.4GRF, Measuring Range 0℃~50℃, Humidity Test Range 20%~95%, Humidity Test Tolerance ±5%, Color White
Aliexpress
I could not find it on Aliexpress. 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. There is no active coupon in my database right now (for Banggood).
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGYUICLO23, AFfbG10, BGWEATH19, BGKGYoupin1, BGPOGODA, BGJDFH17, BG117YUYI, BGYUIHOMEPL, BGYI179, BGBFAFF2019, BGYH5RA, BGY177HE, BGCITYADS2019, BGBAPOHG, BGXT18F, BGYS19, BGVDay10%off, BGHOMEG12, BGYUN98, BGYY267, FBCOUPON1, BGAFF10OFF, bGhOnEy10, BGSE035, BGDQHOME39, BGHome15%, BGGFHOME35, BGSETD035, BGGQHOME10, BGHALLOWEEN, BGHOMEA15%, BGOCFO035, BgcLuBofErtA10, BGNOTD035, BGDEFR035, BGDESE035, BGJATD035, BGCuponation10, 13f142, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – YUIHome Weather Station [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for YUIHome Weather Station.
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)).