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.
Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($15.40): BGLED2203
2. ($16.27): Terence
3. ($16.45): BG00c906
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGYEE11COU, BGYLKG12YL, bgnewleds, BGLIGHT2020, BGYEBWCN, BGdragonBoat, bGhOnEy10, BGAFF10OFF, bgshOOp10, BGYEE20COUPON, BGLIGHT0920, BgoFErTaSchInA10, BGELIG0920, BgcLuBofErtA10, BGYEE2021, BGYEEL10, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGLIG12, BG10OFFAFF1, BGYEELIGHT21, 00c906, ADMITAD2212, 2022ACTIESNL
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 3 another warehouse/versions!
1. China – Yeelight YLKG12YL Single Wireless Smart Switch ($-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
Do you need price history chart (for all/most countries) for Yeelight YLKG13YL Double Wireless Smart Switch? There we go. The lowest price was: $7.59.
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)).