Hi Tony,
Just to confirm the point Don has made. You are able to purchase these products from Apple in the US, but you need to have a buying volume of around $100,000 as I understand it.
Even if you did buy in those sorts of numbers, iphones don't have a massive mark-up on them anyway, and what mark-up is on them is then cut to the bone with competition.
Popular product, absolutely....still one of the hottest sellers on the market, but you need some serious resources if that is a market you want to play in unfortunately.