Caporegime
The price is already online, it pretty much will depend on which model you want and you get a trade in value for your current handset.
Finance. There's always the traditional contract route as well
That's the thing, with contracts, even a £1000 phone is affordable for everyone. Well, it is often unaffordable, but people who have to have the latest gadgets will often ignore that side of it and plunge into a contract they cannot really afford. There's also the fact that mobile phones often have much lower credit demands than other types of finance like credit cards and loans. An eighteen year old straight out of sixth form can stroll into Carphone Warehouse and pick up any phone they like. I've got £800 phones before when I've had a default on my credit file!