Sony Experia E5 £89.95 (O2) + Free £20 Amazon Voucher
Best deal I can find by a long way.
The phone costs £89.95 from O2 but you get in the package a £20 Amazon gift card technically making it £69.95, mega cheap compared to anywhere else.
***Amazon £20 freebie ends 7th June so order quick.
Free delivery included. It will ask you to add a top up on the website but all this means is that you are adding a sim card, no extra will be charged.