Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – DIGOO DG-S601 EU AC 100V-240V 3 Gang Smart WIFI Light Switch [EU] (-3 USD)
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (9.99 USD): BGa28d11
Coupon (12.32 USD): BGHONEY2110
Coupon (12.69 USD): 13f142
(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): BG13S601, BGS6018, BGDigoo15%, BGDGS601, BGaDmITAd, BGBFAFF2019, BGCITYADS2019, 2020CNY, BGVDay10%off, BGDG15, BGSAMH, 20%DG422, BGDGASG, BGSAMRTH, BGELIG0920, BgcLuBofErtA10, BG15SH12, BGAFF10OFF, BGHBHJ105, BGSTHO15, BGS601CN, BGS601FE, BGDGS601CN, BGCuponation10, BGdca113, BGSHOM15, BGb458ad, BGe8df37, BG2ebc5e, 6GSGIT, BGD11075, BG99b8eb, ADMITAD2212, BGSmart6
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – DIGOO DG-S601 EU AC 100V-240V 3 Gang Smart WIFI Light Switch [EU] (-3 USD)
Price history and price alert
Check out price history chart (for all/most countries) for DIGOO DG-S601 EU AC 100V-240V 3 Gang Smart WIFI Light Switch.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).