Your local Licensed Real Estate agent can provide that for free, just ask. They will do a search on the local MLS and email or print out a list for you. You can also go to your local County Assessor's office and ask.
Go to your local goverment website.There you will find an area for search poperties,taxes,etc. Then keeping looking for sales. They will put in the sale date and amount. Or just call a local realtor and they will find the sales price for you in a jiffy from the mls.
Donald is right. The MLS in most areas will track sales prices that can be retrieved for a specific period of time, and a specific area. This can be a very useful tool for accurately listing your home in the current market. Listing prices tell you nothing, other than what the comparables are doing. The issue is that if everyone is over priced and not selling then you doom yourself to the same fate. Consult a professional and the best of luck to you.