Projection of video signals for a cheap price? HOWTO?

How to get a video projecting system for a really cheap price?
Is a setup like a 35cm LCD cell -equiped DIA slide projector enough for a small setup?

What other ideas are possible, using second hand material and a little investement in video equipement?

Used for presentations, I wanted to rig it with a small DIA slide panel, with a width of 1m30, on a 2 or 3 meter triangle Truss bar

Thanks in advance