$23.99 – 1x M5 86 SwitchMan Smart Wall Switch, 2x Screw, 1x User Manual.
According to my DB the lowest price is $23.99 for SONOFF M5 86 SwitchMan Smart Wall Switch (in Banggood). You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Latest price update (UTC time):
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 reasonable price for this item? 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
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
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
Check out price history chart (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)).