Best site is
Newegg.com - Computer Parts, PC Components, Laptop Computers, Digital Cameras and more! I just bought a 370 dollar laptop(including taxes and shipping)
It's a netbook
-160 GB HD
-2G RAM
-XP
-9 inch monitor
-Amazing battery(5+hours)
You can get bigger laptops too, all starting around 500-600 dollars. Best deal on the net. If you are trying to blow over 1k I suggest getting a Mac