Part of Teacher Tech Tuesdays
LCD ProjectorThe main tech tool I use every day is my LCD projector and they can be very expensive but since they have been around for years it is easy to find them on ebay for cheap. The main thing is to find out if you can still get the bulbs for the model. It might not be the newest and best but it will get the job done.
Cheap Document Camera
Here are 2 options if you do not have an ELMO or similar document camera. I made one like the video below and it worked great and took up less room then my ELMO does :)