Unfortunately I don't think they do not ship to the USA (unless something has changed recently), though to be honest if you're in the USA you can probably get PCs and laptops a lot cheaper there just because such things are a lot cheaper in the USA than the UK
This has been asked before and I also am fairly sure that they don't ship to the USA. You could always email them at [email protected], but don't expect a rapid response, email isn't a priority when they're busy.