Sure, I worked and repaired the weapons control/target detection, ranging, bearing, and target tracking related versions of the stuff to the component level in the military since 1987. I was hired by www.FLIR.com when I got out after 12 years of honorable service. Later, I went to for work for another company, seeking even greener pastures on the other side of the fence.
The Price for Thermal Imaging depends on what you want. do you want radiometric imaging or simply colorful pictures? resolution? the cheapest ones are 160*120 and a slow refresh rate (15-20ish FPS) the most expensive are 640*480 (new camera by flir) and a nice 60fps. cheapest=8000US(approx) most expensive=50,000US (approx). For playing around/building diagnostics 8000 should be fine but if you need better quality you have to pay to play.