I have a very ancient laptop from 1998 that I wanted to use to take advantage of free wireless Internet. I walked around with in on city streets and it hurt my back because it was too heavy. I am thinking of getting a new laptop that would not be burdensome to walk around with. What laptops currently on sale are light enough to be carried around in a backpack or a briefcase for long periods of time?

I am currently trying to find a cheap laptop for myslef and i was wondering if there is any Websites out there that i can go to and find Nice Refurbished or used Laptop. (other than ebay) I have already checked ebay out and WHY even deal with them, they question for the pirce u pay in the store.
So if you can i would really like to know if there is Website i can go to find some excellent deals on either (NEW, Refurbished, or used) Laptops.
Thanks