Dear, it's a school, and each class room needs a single camera, a 0.3MP camera fits their need, so a 2MP camera can't replace 3 to 5 cameras or even 2 cameras, and as I told you 0.3MP is okay for the administration, and as they need a low total price, and are receiving other offers, they will not choose my 2MP 150 cameras system.
Sorry I missed the part you were only doing 1 camera in a class room, still you can use 1 NVR seeing that such a low resolution would only use about 50GB every 30 days a 8TB system that you build for around 1K. Good luck to you.