$23.99 – 1x M5 86 SwitchMan Smart Wall Switch, 2x Screw, 1x User Manual.
ATM you can buy SONOFF M5 86 SwitchMan Smart Wall Switch for $23.99 (in Banggood). Just check coupons out (with price alert and history). You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood ($23.99)
Banggood warehouse is located in China. Coupons for SONOFF M5 86 SwitchMan Smart Wall Switch? Nope, there’re no coupons in Banggood. Is it a low price? Hmmm, price is higher than average (which is $19.29 right now), so better set price alert down below…
Link: Banggood product page
Price: $23.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): pROMo8cuPoN, BG15Sonoff, BG8ReviTrage, Cuponation9, 9OFFSUMMER, BG1a25ab, BGsonoff30, BGb537ba, BG57731d
(these codes were not working in latest coupon update, but you can check them out anyway)
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.
Price history and price alert
Here is price history (for all/most countries) for SONOFF M5 86 SwitchMan Smart Wall Switch. The lowest price was: $12.79.
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)).