At the moment, more than likely no.
In six months, who knows..
They just started selling the Razer phone after the three exclusivity expired..
At the moment, the XZ2 premium can be purchased from sony estore, clove and EE with Amazon also possibly getting it at some point.
The phone officially got released in UK on Friday but it looks like a very limited release due to XZ3 being opened for preorder soon.
Worth noting, EE's exclusivity is "network partner" only, so it will be worth keep checking carphone warehouse just in case.