The coupon price for UNI-T UT89XD Multimeter is $32.99 (in Banggood). You can create price alert here, copy coupons and view price history. Best price?
UNI-T UT89X UT89XD Professional Digital Multimeter True RMS NCV 20A Current AC DC Voltmeter Capacitance Resistance Tester – #2
Latest price update (UTC time):
Banggood ($32.99)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. Is it a low price? This price is higher than average price ($32.37) for this item.
Link: Banggood product page
Price: $32.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGM1TOOLS88, BG20236Tool, BG88f121
(there’s a little possibility that old coupon will work)
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
Do you need price history chart (for all/most countries) for UNI-T UT89XD Multimeter? There we go.
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)).