Prices, Supply, Demand
I don't understand how prices are developed for electronic equipment. Why is it you can buy a cell phone which is a transmitter and receiver that comes with tiny full color video displays and a camera that shoots stills and movies. It usually comes with some cool computing capability with a calculator and an address database. Phones can be tracked by GPS. This sort of device can be easily found for around a hundred dollars. Yet you'll be hard pressed to find a good hand-held GPS unit that does some simple proprietorial calculations with a color display for under $200.