Aliexpress
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Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – UNI-T UT332+ Digital Thermometer Hygrometer (79.99 USD)
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 (53.99 USD): BGTOOS729
(CouponsFromChina.com tip: just apply this code 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): BGM1TOOLS88, BGMARCHSALE, BG20236Tool, BG8FORMULAMX, BGBFDAY8, BGNEWYEAR8, BGSPRING8OFF, BGHONEYSP
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – UNI-T UT332+ Digital Thermometer Hygrometer (79.99 USD)
Price history and price alert
Here is price history (for all/most countries) for UNI-T UT331+ Digital Thermometer Hygrometer.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).