Americans are great on customer service, got some bits from Monkeywrench Racing for my bro delivered to the hotel I was staying and it was no probs at all.
Picked up some cams, high cc injectors with extended harnesses, AEM dry flow filter and some other bits.
No problem with hotel receiving them, just let them know about it and airport security was cool about it too and no issues once back in the UK, customs or otherwise.
Just allow for enough room in your luggage
Didn't someone on here buy some Berk HFC's while over there?