Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – BlitzWolf BW-SS2 100W/50W RF 433MHz Relay Module (-3 USD)
2. Europe – BlitzWolf BW-SS2 100W/50W RF 433MHz Smart Switch 2 Way [EU] (-3 USD)
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 USD
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
Old coupons (from the oldest to the newest): BGBWSS2, BGSS21, 13f142, BG9NY, BGBWSS02, 2020CNY, BGVDay10%off, BGSAMH, bGhOnEy10, BGSM15, BGBWUU1, BGSMOFF, bgshOOp10, BGSAMRTH, BGBW152, BgcLuBofErtA10, 10%ForNewBW
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – BlitzWolf BW-SS2 100W/50W RF 433MHz Relay Module (-3 USD)
2. Europe – BlitzWolf BW-SS2 100W/50W RF 433MHz Smart Switch 2 Way [EU] (-3 USD)
Price history and price alert
Check out price history chart (for all/most countries) for BlitzWolf BW-SS2 100W/50W RF 433MHz Smart Switch 1 Way.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).