QANTAS cuts AU$4,000 from price of Mac Pro

Of course it was a mistake, but the apology to 'buyers' included a 20% discount code

Apple Australia's base price for the Mac Pro is AU$4,899. So when Australian airline QANTAS store for frequent flyers started offering the computer for just AU$$520.53, plus 5,000 frequent flyer points, news of the bargain quickly hit sites that track this sort of thing."