Go down and check coupons out. Remember to check price history if it is available. 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 coupon and price update (UTC):
Detection distance: 7m, the night light will turn on automatically, Work with other Xiaomi smart devices, Detection angle: 170 degree, Intelligent induction: when somebody goes through, Built-in 1pc CR2450 cell battery
Banggood
Banggood warehouse is located in Europe 
. There is no active coupon in my database right now (for Banggood). Uhm… There’s no price history (in my database) for this product right now.
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): HU19165, DAQIR, 1d7dcd, 2019SPEDM, BG1AQPIR, BGAQ11PIR, bgssaff9, BGSUAQPIR, aff7off, BGaDmITAd, BGPIR09, bgchinafest, BGBFAFF2019, BGIR09, BGCITYADS2019, 13f142, BGAqaraES, 2020CNY, BGAQ201, BGAQ20, BGAQIR3, BGSAMH, BGHOMEAPP, BGAQA15, BGPIRAQ, BGAQIRHK, bGhOnEy10, BGSM15, BGSMOFF, BGAQHS7, BGAQAPIR, bgshOOp10, BGAQPSCZ, BGSAMRTH, BGELIG0920, BgcLuBofErtA10, BGAQHSE, BGAQPID, BGAQIRSE, BGAqaraPI, BGAFF10OFF, BGSTHO15, BGCuponation10, BGAQHSZ, BG811a43, BGHONEY2110, BGSHOM15, BG460cb9, BGe52095, BGSHE15, BGbb60e2, BGGROC011, BGGECZ011, BGcou929, 6GSGIT, BGa2b27e, BG9fae1a, BGD11049, BG5e7355, BGB5061, BGffd477, BG7b3f1a, BGf75c7f, ADMITAD2212, BG4fc3f3, BGPLWIOSNA63, 2203ActiesNL, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGJUNEGSG9, BG8ReviTrage, Cuponation9
(these coupons are old, so probably won’t work)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $13.29.
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)).