If you're in the market for a house, i found this great site...it actually tells you what the home sold for during previous sales for Fairfax. Just put in the address of the home for sale, and it will give all kinds of info on that property (including all previous sales!) Remember that the owner may have put some money into the home, but it will definitely give you an idea of how much "profit" they're trying to make...some are realistic...some are just darn greedy...especially considering today's market. Very Useful info for future buyers!!!! Pass it along!!!
http://icare.fairfaxcounty.gov/Search/GenericSearch.aspx?mode=ADDRESS