Talk to Roy why he likes the E4.
I know of several Flir 320x240 cameras used for under $1k.
When I started out there were not a lot of cameras to pick from and a 320x240 camera was $$$$$. Today, I wouldn’t do any building inspection with anything under that.
The E4 was one of the first small cameras that came in with 320x240 that I remember. I was satisfied with it when I got to play with one at Flir Inframation.
Remember: the resolution is not the key to a good camera. It just happens that most cameras with higher resolution have better specs all around as a rule.