I got mine, SIM free, from Amazon UK for £399 (it appears it was an unwanted upgrade as I have the Vodafone firmware but, strangely, no branding) and signed up to O2 Simplicity for £10 per month with unlimited internet for an extra £5 a month.
I initially tried to buy it from CPW on a T-Mobile contract but it was like banging my head off a brick wall.