The Raspberry Pi might have made PCs affordable, but C.H.I.P. is even cheaper (cheap as C.H.I.P.s, you might say). It costs just $9, which works out at £5.80. Bargain.
Despite this low price, it's a fully working computer, able to surf the web, run games and video, and store documents and files on its onboard storage. Specs-wise, it has a 1GHz processor, 512MB of RAM and 4GB of storage, plus 802.11b/g/n Wi-Fi and Bluetooth 4.0. It's not going to run Grand Theft Auto V, admittedly, but it'll be more than adequate for basic tasks.
You'll need a keyboard, mouse and monitor to use C.H.I.P., but if you want to use it on the go you can buy PocketC.H.I.P. It's basically a housing for the module that looks like a bit like a Game Boy. It has a 4.3-inch screen and QWERTY keyboard so you can use it on the bus.
Read more: Raspberry Pi 2 review
The basic C.H.I.P. module has a composite output, but you can add an adapter for either VGA or HDMI, so you can game and watch videos in HD. It runs Linux, the open source operating system, and comes pre-loaded with Scratch, an easy to learn language that teaches you programming basics so you can make your own games and animations.
Connect a MIDI keyboard and you can make sweet music.
It's an amazingly versatile piece of kit for just £5.80. At time of writing, it's raised over $600,000 of a $50,000 target, and will ship in December. One for the Christmas list.