Orange have the Sony Ericsson K750i on their website for just £89.99 including £10 free airtime. Unfortunately you have to buy £10 airtime when you make any purchase there, so to make things less confusing I'll start again... you pay £99.99 and get the phone and £20 airtime. So the effective phone cost (after airtime has been used) is just £79.99. Get £5 cashback when you purchase through QuidCo, bringing the cost of the K750i itself down to just £74.99.
The Sony Ericsson K750i is a high-spec, 2 megapixel cameraphone with Autofocus. There's a large 220x176 pixel display, which is great for watching videos or playing 3D games. For further entertainment there's a built-in RDS FM radio and MP3 player. The K750i has 32 MB internal memory and is supplied with an addition 64 MB memory stick. The capacity of the K750i can be upgraded to 1 GB, that's enough to store hundreds of MP3 files, video clips, photos and games - all in your pocket. It also has Bluetooth connectivity and PC synchronisation.