I recently found a little shop called "Recycling for charity" in Upper Hutt.
They take old computers to bits and sell off parts. Not sure how old school they are but saw some late 80's early 90's things there amongst piles of more recent bits and pieces. Just went there to get rid of some old PC's that died ages ago and was very tempted to buy a few things.
Worth a look if you are in the area and like to collect junk