Aliexpress
Click here… to search for HT-18 Infrared Thermal Camera on 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 (438.83 USD): BGherra
(CouponsFromChina.com tip: you should apply the coupon 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): 502C6B, 36e77d, 11DANIU, DANIU, BG20DANIU, BGDANIU, c2b135, BGTR15, BG2647, BGBG4683, bGpAnDacHeCk, BGMPB2020, BGAFF10OFF, bGhOnEy10, BG8688, 7d18f7
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for HT-18 Infrared Thermal Camera? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).