You can definitely find a good camera for around 75$ on ebay. I won mine in auction for 50$ and it records in HD 1080p. Although the cameras you find might have good video quality, the audio might be a little crappy. So getting an external mic and recording the audio from there would be a good idea or even better, try to find a camera with an external mic input so that way you can connect the mic to the camera so that the audio goes right onto the video from the microphone. Although I doubt you'll find a camera that has the microphone jack for under 75$ but you can definitely find a decent camera on Ebay around that price.