Whats a good inexpensive motion detection surveillance camera to be used indoors?

Im looking into getting a motion detection hidden camera to put in my place. Since im gone days at a time (4 days or so a week) I wont have time to replace the tape so that's why I want a motion detection. Also not to expensive either (around $50 or$100). Anybody recommend any? Do they have to/can they be recorded on a dvd player Thanks in advance