The mini-laptops are lighter and cheaper than their larger rivals, but still have full keyboards.
The service says netbooks took seven of the top 10 spots on Amazon.com's computer bestseller list by the end of Monday, with a few high-definition LCD monitors from Samsung and an Apple MacBook taking the remaining three spots.
Asustek Computer's Eee PC 900HA with an 8.9-inch screen, Intel Atom microprocessor, Microsoft Windows XP and black finish took the top spot, but it exchanged the lead throughout the day with Acer's Aspire One several times during the day. Amazon updates its bestseller lists every hour.
The Aspire One took second and third place on the list, with the black version topping the sapphire blue one as the favoured colour.