Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Rated Current: 16A, Rated Voltage: AC250V, Working temperature: -10~+40°C, Version: Single Button Version, Product size: 86*86*39.2mm, Working humidity: 0%-85%RH, Double Button Version, Triple Button Version, Installation Hole: 60mm
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($15.40): BGLED2203
2. ($16.27): Terence
3. ($16.45): BG00c906
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGYEE11COU, BGYLKG12YL, bgnewleds, BGLIGHT2020, BGYEBWCN, BGdragonBoat, bGhOnEy10, BGAFF10OFF, bgshOOp10, BGYEE20COUPON, BGLIGHT0920, BgoFErTaSchInA10, BGELIG0920, BgcLuBofErtA10, BGYEE2021, BGYEEL10, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGLIG12, BG10OFFAFF1, BGYEELIGHT21, 00c906, ADMITAD2212, 2022ACTIESNL
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 3 another warehouse/versions!
1. China – Yeelight YLKG12YL Single Wireless Smart Switch ($-3)
2. China – Yeelight YLKG14YL Triple Wireless Smart Switch ($-3)
3. Europe – Yeelight YLKG13YL Double Wireless Smart Switch [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Yeelight YLKG13YL Double Wireless Smart Switch.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).