Originally posted by: jonnylentilbean
Sorry in advance, this post got long for a gain of about $90....
I posted this in my own Finder's thread a while back, but one that stands out recently is an IBM 'model-m' keyboard. I managed to find it in-box for $5 at a thrift store with most of its original shrinkwrap, evidently never used. I currently have it hooked up though barely use it, and the box is on a shelf.
But the fact of the matter is that depending on the particular IBM model-m keyboard you have (and model-m is a generic term for mostly 80's and very early 90's IBM keyboards with springs under the keys), the value can be ridiculous. Even the most common models loose and typically very used-condition go for $20+. Check
ebay. My buddy is a big fan as well and on some forum, and he got mine boxed appraised at about $95.
TL;DR: Look for IBM "clicky" keyboards at thrift stores. They have actual springs under the keys. People like me are obsessed with them, and people pay stupid prices for them.
I just passed up an in-box black one today. I might have to go back and snag it.