Any New York members?

I'm currently planning a trip to New York in the summer. Mid-july or august and wondered...

is it goning to be worth me trying to get hold of a sim-free iPhone (obviously after release date) in manhattan? or waiting for uk release (about six months later!) ?

really keen on getting one, but wonder whether it's gonna be worth me hunting around for one. not interested in entering into a contract (being UK-based and all) so it's sim-free only for me...

many thanks in advance.