stinkjones asks: "I recently found a project on Hackaday, which I found very interesting. It was linked to Tom's Hardware, and involved a massive, and cheap, projector. I have an LCD projector, but this seems like a great project with a pretty cool result. I already have an LCD that's perfect for the job but overhead projectors are hard to find. Retail they are around $500 new or a lot more, and if you can find them used they have a huge range of prices. Does anyone know where to find a cheap one?"