There are many different types of monitors. They range from all sizes from 14 inch to 24 inch. And you can get them in the flat screan.
The one we have is a Sync Master 750s 17inch and we payed $200 for it. They range from all prices too from $130 to $2000. You also can go with the new flat screan monitor they make less heat and are alot smaller. There are many place to look for monitor on the internet like on TC Computers. They are all out there just look around. We got ours from a place near us called Compu-tec.