Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – BlitzWolf BW-SS7 ZigBee3.0 2300W Smart Light Switch Module 2 Gang (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t really know if this price is reasonable, coz there’s no price history in my DB. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (21.24 USD): BGSmart6
(CouponsFromChina.com tip: this code has to be applied 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): BGBWSS7L, BgcLuBofErtA10, BG15SH12, BGBWSS7, BGSS7BRB, BG1BWSS7, 10%ForNewBW, BGSTHO15, 10%ForBGBW, BGHONEY2110, BG7e9fa8, BGbd9387, BG9ca159, BG61e0ae, BGSHOM15, BG414b08, BGSHE15, 13f142, BGTYSE857, BG5262a9, 6GSGIT, BGD11009, BG3f3209, BGB5009, ADMITAD2212
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – BlitzWolf BW-SS7 ZigBee3.0 2300W Smart Light Switch Module 2 Gang (-3 USD)
Price history and price alert
Price history is not available for this item (not enough database records)! The lowest price was 14.99 USD though.
You can set price alert (for Banggood).