The company that make the Raspberry Pi series of Educational computers have released another model "Raspberry Pi Zero" that costs a mere $5 dollars (NZ 7.60). This is basically a stripped down "Raspberry PI Ver 1" but with a 40% speed boost and double the RAM. There are no Internet connections so this unit is designed for Off line use. It is powerful enough to run a full version of Libreoffice or stream a HD Video. As it only has one USB port a USB Hub would be useful to give extra ports needed for keyboard, mouse, flash drives, bluetooth etc. Physical dimensions are 65 x 30 x 5 mm. General purpose Input / Output connections are available but require wires to be soldered in. All common programming languages are supported.