The school wants to but two of them. According what they say, 300-450 EUR is what they could pay for a each one. There are two differend kind models that convinced me but I thought I'd give it a shot and ask if anyone had an experience with these type of devices.
Full HD LED Beamer 2000 Lumen 3HDMI 2 USB | eBay
AAXA P4 Pico Projector - DLP Hand-held Mini Projector