In the late 1990s, the average desktop PC cost about $1,000, while the average laptop cost about twice as much
Because of new technology and economies of scale, the price difference has largely disappeared and consumer preference has tilted toward portable PCs, including new miniature netbooks.
In the third quarter of 2008, laptops outsold desktops for the first time, according to research firm iSuppli. According to NPD, the average desktop in February of this year sold for $658, just $13 less than the average notebook. (info from The Wall Street Journal)