If you are on Vodafone, you can get a decent phone(a vodafone 716) for about £30, £3 cheaper in vodafone stores though. Spec for it is:
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1.3 megapixel camera
MP3 player
Polyphonic ringtones
Radio (I've found this feature to be better than my current phone)
Micro SD card slot
GPRS
Bluetooth
However over time my battery tended to die fast, but for the spec its value for money.
