NEC's multimedia projectors cost from $310 to about $5,000. They also make cinema projectors which are even more expensive.
Mitsubishi makes some of the most expensive projectors. They have lines that cater to the high end buyer and offer projector with DVD combinations built in as well as projectors that broadcast in full HD.
School projectors can cost as little as $30 if you get ones offline from sites such as eBay or Amazon, but you could probably get them more expensive from a genuine store.
"TV projectors can range in price depending on if they are high definition or not, brand and style. A high definition TV projector can range from $60 to $2000 depending on the different factors listed earlier."
Some lower-output projectors (and all of the new so-called 'nano' projectors) use LED's for their light source. Most higher-output projectors use incandescent halogen or HID lamps for the light source.
The company that makes the least expensive overhead projector is Nobo Quantum. Their projectors start at $150 and go up to $500. Their products can be bought on their website.
Dirty Projectors was created in 2002.
Infocus projectors are made for the office, home, classroom, and for all presentation needs. Infocus projectors can also be useful in churches and the courtroom. The projectors are for presentation purposes.
www.hdprojectorworld.com yes and most projectors on this website sell the projector that does what you want and at a relatively good price so check out the URL I gave you
LCD projectors are by far the best
Most projectors have the means to be a rear and front projection system. The only projectors that are unable to do this are the cheaper projectors you find at Office Depot used for powerpoint shows.
If you are a teacher who wants to have projectors so that you can have your students give presentations while they are in class, you should consider getting projectors with speakers that are built into them. This can save you a step. You will not have to worry about finding your own speakers and then hooking them up to the computer as well. This makes everything easier so that your classroom functions more efficiently at all times.