Where can I find a website that has good conditioned laptops with price range $50-$200
If you really want a "good" laptop you will need to spend more than that. Your best chance right now though is just to check ebay regularly. When you search for laptops sort by "lowest price first" if you are trying to find something inexpensive.
Craigslist in any college town or a pawn shop. Pawn shops usually check electronics before purchase so a decent bet