Thermal Camera Systems designed for use in human body temperature screening are complete systems and start with prices of about $(US) 30k. Dual Waveband cameras without additional system components and special software start in the $(US) 100k range.
But as mentioned earlier, there is no need...
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BTW, in the Infrared there is not much difference between humans except for their temperatures and temperature distribution.
In the 8 to 14 micrometer waveband, for instance, we are all effectively pretty much the same and "black" with spectral emissivity mostly greater than...
This discussion suffers from lack of real data.
Mentor Edit: Please feel free to share any valid information you have. Links to sites selling your products defeats the purpose of having a meaningful discussion *here*.