The Carphone Warehouse still have the Sony Ericsson J132 for £4.95. This time it's on Virgin pay as you go. You need to buy £10 airtime with it. Next day delivery is free and you can get £5 via QuidCo: this means that after QC it's £9.95 for the phone and £10 airtime!!
The feature list on the J132 is refreshingly short. There's a very basic 128 x 128 pixel CSTN display, FM radio with loudspeaker, torch, speakerphone, vibrating alert, SMS messaging with predictive text, basic organiser functions and a dust-resistant keypad. That really is about it, except that the talktime is an impressive 9 hours with up to 18 days standby time, and the whole package weighs only 76 grams.