The Lepton3 breakout + Raspberry Pi(a clone works too) and a display could be a good option if you're willing to tinker to get it working.
What do you need the camera for? There are a few good options on the used market too, but they might not be fit for your your needs(analog video out, etc).
Who uses a Pi? It's useless if you want to stream into your PC. You can stream it into the Pi, but then you need to capture the image and transfer it with an SD card or something. Now if there was a USB breakout board for the lepton, and it allowed you to plug it directly into your PC, now THAT would be a good thing.