Developed in Argentina, this little elevator from Dayton looks sleek by the stairway, has a footprint of a square meter, installs in a few hours, and is capable of lifting a standing person of up to 450 pounds up two complete storeys. You can even take it with you when you move.
Dayton Elevator distributes the "Pneumatic Vacuum Elevator".
Alibaba links to another one manufactured in Egypt.
I see online references to the Dayton one being about $25000 in 2005 and another reference to the Egyptian one being about half that price.