a further problem not considered...
The real problem is that for any sort of ordinary tech toy, a US shop buys from a manufacturer or wholesaler at a wholesale price and then offers it with whatever markup they see fit plus any taxes if applicable. Most of the price comparisons here are done on the odd assumption that our local distributor has to buy at US retail price before shipping the items here and attempting re-sale to we unhappy locals. In contrast if _we_ hop on a plane to defeat the unreasonable markups (or phone a friend or something) we will have to buy at retail... assuming anyone actually pays full whack for anything there.
Interesting of course to consider companies who don't have a wholesaler in the fulfillment chain, mostly those who manufacture and sell directly to the end-user... which includes Apple and seemingly now Microsoft amongst others. In this case they presume a build cost, a fixed markup and then set their retail prices. The attempts to wring more out of, to them, foreign customers just represents a poorly thought out strategy of passing on extra costs (like shipping from California regardless of where its built) directly to those customers. As the brand stores here have discovered, customers are happy to find ways to access goods at the cheapest price they can see it anywhere in the world, anti-competitive restrictions notwithstanding (and clearly we're becoming more and more adept at working around those too).