You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Quantity: 1 Set, Current: 0-100A, Voltage: AC 50-500V, Item: Indicator Voltmeter & Ammeter, Mounting aperture: 22mm, Material: Electrical components, Panel size: 29x29mm, Display color: Red / Blue / Green / Yellow / White
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($7.53): Cuponation9
2. ($7.78): BG00c906
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG3901f1, BGd0b05d, 00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, 8Couponsde, MVC8SPRING, BGJUNEGSG9
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for AC 60-500V 0-100A D18 Square Digital Display.
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)).