Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Gosund SP211 16A Smart Plug (-3 USD)
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I can’t find any active coupons for this product in 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): BGcou259, BG2f8a17, BGD11026, BGB5035, BG7f97b1, BG0d171e, ADMITAD2212, BGSmart6, Cuponation9, BG8ReviTrage, BGcoupon8off, BGGutscheine
(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. China – Gosund SP211 16A Smart Plug (-3 USD)
Price history and price alert
Check out price history chart (for all/most countries) for Gosund SP211 16A Smart Plug 2pcs.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).