e2save have the Sony Ericsson T303i on their website for just £24.95 with free delivery when you buy £10 airtime on o2, Virgin or Vodafone pay as you go.
Whilst there's no guarantee that it's unlocked, it's very likely.
The Sony Ericsson T303i mobile phone has been made to appeal to a wider audience, petite and good looking, it offers designer good-looks without the price tag to match. With essential features including 1.3-megapixel camera which allows you to catch all the fun as it happens, a built-in FM radio allowing you to listen to all the latest tracks. Share multimedia files via the built-in Bluetooth and store them with the 8MB of internal memory. Plus TrackID allows you to identify any track that you cant put a name to. The Sony Ericsson T303 provides a pocket-sized convenience and premium good looks.