But of course you can't simply go to a store and actually buy a Notebook with Windows 7 installed. You have to buy a business class notebook.
I recommend the ThinkPad series, they are very well built, excellent support and don't come pre-loaded with a bunch of crap (HP, ACER).http://shop.lenovo.com/us/en/laptops/thinkpad/
They start at $500 for the E-series, $600 the L-Series. But its the T, X and above that rugged and cost more. All of them have the option for Windows7 64bit Pro edition. They usually deliver in 8~10 days.