Honestly, with the exchange rate, stuff from the US is no longer a good deal, and you can find almost everything here nowadays (10+ years in the UK but from the US, travel back once or twice a year). I still bring back lemon pepper seasoning, Twizzlers, and mint M&Ms - but with a bit of looking you can find all of those here. Crest Whitestrips are a good shout, though - haven't seen those in the UK and they do work. I also get big bottles of Advil (none of these little blister packs you have to re-buy after a week!) - NyQuil is useful but I think it's the same thing as Night Nurse, isn't it? Also if he's near a Target they have Pixi makeup/skincare for prices that even with the exchange rate are lower than what you pay here!