Consumer notebook computers managed to outsell their desktop counterparts for the first time in 2007, thanks largely to the introduction of low cost notebooks such as ASUS' Eee PC and strong advertising campaigns for Intel's Centrino technology. Overall market figures, including corporate purchases, saw notebook sales rise 21% to 31.6 million units, whilst desktop sales fell 4% to 35 million units. Notebook sales are expected to account for 66% of the overall market and 71% of the consumer market by 2011. ASUS' Eee PC can be had for just $299, whilst reasonably equipped Celeron-M and Pentium notebooks can be found at some retailers for between $399 and $499, both of which have driven this surge in sales.