Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
0.5℃, -20℃ to 50℃ (-4℉ to 122℉), ±2% or ±2℃(±4℉), Emissivity: , 76, 289g, Infrared image Resolution: , Image Storage: , Operating Temperature: , 5 mintues/20 minutes/ not power off automatically, Auto Power off Time: , CE, -5℃ to 40℃ (23℉ to 104℉), Visible image resolution: , Item Size: , 0.1-10.0 Adjustable, Thermal Sensitivity: , SD card(4G), Measuring Accuracy: , Authentication: , Focus Mode: , Image Frequency: , full infrared and full vision Visible image with 25% step length, 0.3 mega pixels., Temperature range: , 800 pixels, 320*240, Battery Supply: , Relative Humidity: , built-in chargeable 18650, 3.2” full-color screen, Vision Option: , 10%RH to 80%RH, Thermal sensitivity: , RoHS, Model, 8HZ, -20℃ to 300℃(-4℉ to 572℉), File Format: , Wavelength Range: , Storage Temperature: , USB: , 27°×35°/0.5m, 8-14μm, Display: , 223×105×90mm, Item Weight: , Total Pixel: , 0.07°, JPG, HT-19, Fixed, Micro USB2.0, FOV/Shortest Focal Length:
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($529.99): BGb92f03
2. ($597.87): BGherra
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG2647, BG5757, BGAFF10OFF, bGhOnEy10, BGHT19, 7d18f7
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for HT-19 Infrared Thermal Imager Camera 320×240 is here.
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)).