I picked up a basic one for about $60 on aliexpress. It's good enough to find heat leaks at home, but only barely, and to get usable results I had to turn the h

I picked up a basic one for about $60 on aliexpress. It's good enough to find heat leaks at home, but only barely, and to get usable results I had to turn the home heating to maximum (to increase the thermal contrast). The ones that let you just walk into a house and immediately see cold areas cost more like $800.