In a quick 5 minute search, the only site I found that appears to offer an automotive FLIR commercially is:

http://www.imaging1.com/thermal/Thermal_Camera.html

I'm sure there are others but this was the only one that seemed like it may sell to individuals, the others read more like commercial/industry.

Warning, Warning, Warning. FLIRs are still VERY expensive. I'd be suprised if you could find one for less than $10-20K.

I haven't checked into availability from a wrecked caddy yet.