I have just checked coupons. The lowest price I could get is $18.99 (in Banggood). Peacefair PZEM-008 AC50-300V/100A LCD Screen Digital Voltagemeter Multifunctional with Active Power Battery and Current Measurement Backlight Feature.
Updated:
Banggood
Warehouse in China.
Link: Peacefair PZEM-008 AC50-300V/100A Voltagemeter
Regular price: $19.99
$18.99 with coupon: BGMAI666
Additional Banggood coupons:
1. First page
2. Second page
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Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was $13.99).
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)).