$16.99 – Casing Material: PC V0, Input/Output: , POWR316D: 100-240V~50/60Hz 16A Max, Wi-Fi: IEEE 802.11 b/g/n 2.4GHz, Model: POWR316D/POWR320D, Product type: Smart Power Meter Switch, POWR320D: 100-240V~50/60Hz 20A Max, Brand: Sonoff, Color: White, Dimension: 98×54×31mm.
When I was updating this page the price was $16.99 for Sonoff POW Elite 16A Smart Wifi Power Meter Switch (in Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Latest coupon code price check (UTC time):
Banggood ($16.99)
Banggood warehouse is located in China. CouponsFromChina software could not find any coupon for this product in Banggood. Is it expensive? According to my database, the average price is $18.03 and current price is $16.99, so it’s probably a good price!
Link: Banggood product page
Price: $16.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGHU2510, Cuponation9, BGHU2515, BG8ReviTrage, BGc99ed5, BG583659, BG89a7ae
(you can check these old coupons out, but these probably won’t work)
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 POW Elite 16A Smart Wifi Power Meter Switch. The lowest price was: $13.99.
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)).