When I was updating this page, then coupon price was $11.99 for DDS518 5-32A 230V Digital Single Phase Power Watt Energy Meter (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
DDS518 5-32A 230V Digital Single Phase Power Consumption Watt Energy Meter kWh Electric Din Rail Type Wattmeter
Latest coupon code price check (UTC time):
Banggood ($11.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. But wait a sec… Is it a good price? Well, according to CouponsFromChina database this price is the best in history (2 records).
Link: Banggood product page
Price: $11.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for DDS518 5-32A 230V Digital Single Phase Power Watt Energy Meter is here.
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)).