Good, thanks alot! Do you have any shop of preference in particular?

I think this depends on where you'll be staying in the US. The initial shortage seems to be completely over now and so they're available more-or-less anywhere. Obviously Apple Stores, but most major electrical retailers are carrying them. The warranty is honoured world-wide, so you should have no issues with any problems that you might encounter once you get back home.

I hope you have a great trip.

Tim