Phones4U have the refurbished Motorola PEBL U6 on o2 Pay As You Go available on their website for just £89.95. Purchase via QuidCo.com and you'll get £5 cashback, bringing the effective phone cost down to just £84.95.
Network offers available on o2 at the time of writing (11th August) are FREE weekend calls from your chosen postcode with O2 Long Weekends (see o2 website for details) and 10% extra on your top-ups with o2 rewards.
The Motorola PEBL U6 has a smooth and cool clamshell design with dual colour screens. It has a unique responsive opening mechanism that allows users to open the phone one-handed. It's main features include Bluetooth, Push-To-Talk, video playback, 5 MB internal memory, a VGA camera plus polyphonic and MP3 ringtones.