Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – BlitzWolf BW-IS6 2G/433Mhz/WIFI Smart Home System [EU] (-3 USD)
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (43.99 USD): BGCSONP
Coupon (45.99 USD): BGIS6FRM
Coupon (50.99 USD): BGSTHO15
Coupon (53.99 USD): 10%ForNewBW
Coupon (54.99 USD): 7d18f7
(CouponsFromChina.com tip: you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGSAMH, bgzapBIS6, bGhOnEy10, BGSM15, BGBWUU1, BGSMOFF, bgshOOp10, BGBWIS608, BGBW152, BGBWIS609, BGSAMRTH, BGHU972, BGBWIS610, BgcLuBofErtA10, BG15SH12, BGCuponation10, BGHONEY2110
(you can check these old coupons out, but these probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – BlitzWolf BW-IS6 2G/433Mhz/WIFI Smart Home System [EU] (-3 USD)
Price history and price alert
Check out price history chart (for all/most countries) for BlitzWolf BW-IS6 2G/433Mhz/WIFI Smart Home System.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).