Aliexpress
Click here… to search for UNI-T UT58D Multimeter on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (55.95 USD): BGherra
(CouponsFromChina.com tip: apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): AFfbG10, BGVDay10%off, BGAFF10OFF, bGhOnEy10
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for UNI-T UT58D Multimeter? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).