If you're interested in getting involved in tiny printers, but £200 is more than you can afford, then you can always make your own: http://gofreerange.com/hello-printer
This page highlights a bunch of cool use cases for a gadget like this, quick sudoku puzzles, weather, maps, a few twitter post etc. It would be nice to have a daily sheet containing these printed out every morning for the bus, especially if you don't own a smartphone.