Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
Coupon (153.31 USD): BGherra
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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, BGAFF10OFF, bGhOnEy10
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for XE-28 SeeSii 60×60 Infrared Thermal Imager is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).