Network Camera w/Audio - Recommendations?

I have a school wanting to mount a network camera on the ceiling of an auditorium to make video and audio available on the LAN so teachers/directors in a different room will know when to send actors onstage. It doesn't have to be great video or audio, but it does have to be clear enough to understand dialog. I am assuming I will have to hook up an external microphone. Either a box or dome camera would work. I work at a K-12 school so cost is important. I would like to set it up so anybody on the network could access it through it's web interface without a password. We are a Mac district, if that makes a difference. Anybody have any suggestions of a specific camera?
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