When I was updating this page, then coupon price was 24.99 USD for UNI-T UT123D (in Banggood). You can create price alert here, copy coupons and view price history. What is the best price?
Latest coupon and price update (UTC):
Banggood (24.99 USD)
Banggood warehouse is located in China. There are no coupons available at this moment in Banggood. Good or bad price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal 23.49 USD)
Link: Banggood product page
Price: 24.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGM1TOOLS88, BG07a110
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
Click here… to search for UNI-T UT123D Multimeter on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for UNI-T UT123D Multimeter.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).