Raspberry Pi made computers cheap, but when you want to use it in a standalone application it requires some kind of display and a keyboard with maybe some extra USB ports and access to the LAN port, then these things can get a bit messy.
PiKasa is a complete kit that turns your Raspberry Pi into a laptop for just $99. The project is live on Indiegogo. For $75-$99 pledges you can get a complete solution which includes a 7-inch 800 x 480 resolution LCD panel with HDMI interface, ABS plastic housing, built-in keyboard, audio amplifier, speakers, power supply, 5 USB ports, Ethernet port, 12 volt DC power converter, and battery charger. A battery is not included, but a single cell 3.7v Li-ion battery can be used.
The Campaign is attempting to hit a fixed funding goal of $25,000. However, there is a $25 shipping charge outside of South Africa where this project is based. The campaign will end around the middle of April 2015.