Just check coupons out (with price alert and history). Best price?
2*AA Batteries (Not Included), TUV EN14604: 2005/AC: 2008, ≤95%RH, non-condensing, φ98*32mm, 145g, -10℃~+55℃, BW-OS1, DC3V, 2.4V±0.1V, ≥85dB@3m
Aliexpress
There’re some similar (or not) items 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 Europe . There are no active coupons for this product, but the price is pretty low isn’t it? This is new product in my database, so I don’t know if this price is good.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): bGhOnEy10, BGBWUU1, BGSMOFF, 13f142, bgshOOp10, BGSAMRTH, BGBW152, BGAFF10OFF, BgcLuBofErtA10, BG15SH12, BGSTHO15, 10%ForNewBW, BGOS102, 10%ForBGBW, BGHONEY2110, BGSHOM15, BGSHE15, BGbffb3b, BGbd67f6, BG6f85fb, 6GSGIT, BGd8343d
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – BlitzWolf BW-OS1 Smoke Detector ($-3)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $9.99.
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)).