You can get the best deal for school projectors by searching online on Amazon, eBay and even on Craigslist though you want to be sure that you're not getting scammed.
You can find the best prices for modern, good quality school projectors through browsing it online at amazon.com or buzzle.com. They offer great discounts and reasonable prices.
I haven't seen a retro school projectors on the market today but, If you really like the old school projectors you can get some restored projectors for a good price. anonymous@oola.com
LCD projectors are by far the best
HD projectors are, in general, not a cheap item to purchase. However, Best Buy does offer several HD projectors ranging in price from under $650 to over $1,400.
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.
Panasonic projectors can be purchased at a variety of retailers. The best prices can be found at Best Buy, Amazon, Office Depot, Sears, Ebay and New Egg.
It depends a great deal on which projector you have purchased, some will support HDMI, others only VGA! Look into some higher end Epson projectors, I know they have HDMI.
PROJECTORS
Some of the best brands of projectors for the home theatre include Sony, Acer, Epson, and Panasonic. Other brands like Optoma and BenQ are great as well.
Have your parents professionally approach the school administration or board of education.
Epson power lite projectors are great for showing notes. They have a great line matrix and this makes it easier to read text on them.
You're likely to find the best deal on a TV projector that has been used. Try looking on http://www.Amazon.com, and you're sure to find a high quality product, for a great price.