Most of electronic devices are not build to last for ever, and you can see that by visiting your local recycling area for electronic waste. But there are many parts in lets say a printer that the makers can salvage. Personally when I have free time I like to  disassemble printers,scanners,backup devices not only for salvaging parts but also for getting a better idea on how they work. There is so much electronic waste around us, that for things like lcds we probably wouldn’t have to pay a single buck again.  Josehf Murchison wrote a nice instructable full of code examples and pictures about salvaging LCDs. You can find it here. I think it worth’s the reading.