Harvey Norman set up Headphone bars in all their stores and changed them after only a couple of months (Domayne did the same). I went into my local Gold Coast stor in October and was looking at various iems when the guy in charge of that section approached me. As a result I got to listen to the XB4As and the Klipsch X10is. The Sony's were going for about $450 and the Klipsch for just $350. Within a month the bar had been reduced in size and while both the Klipsch and the Sony's were there they weren't prominent.
Based on this I'd say that Harvey Norman's have got a lot of stock to get rid of so if you want them then go for it. The major issue for these sellers is that they can't compete with Ebay etc as people look for the cheapest price. Domayne had the excellent Denon D5000s for audition but they were selling for a ludicrous $1100. Add $200 and you've got yourself a genuine pair of Sennheiser HD800s from an Asutralian online dealer. So yes, whatever the issue, electronic gear is so overpriced in this country that many of us buy off shore.