Gadgets from decades ago can be a lot more valuable than you think. Things like the original Apple Computer made by Jobs and Wozniak are worth a hell of alot more now than they did when they were originally released. Working models are rare and many value them highly. The same goes for all sorts of other gadgets and tech presented in this infographic by PortableUniverse. So if you have a working piece of retro tech you could make a lot of money from it.