I agree with Diane. Contact a real estate agent in the market you are interested in and they can provide you copious amounts of data to your hearts delight! Depending on their Multiple Listing Service (MLS) most agents should be able to provide you Listing Price to Final Sale Price. I would also ask for any seller subsidy and subtract that from the final sales price to get to a true net sales price. Also the real estate professional should be able to also tell you if the buyer what type of financing the buyer used: be it a conventional, FHA, or VA loan, or if the buyer paid cash for the property. Cash buyers can indicate investors and you may see patterns that some zip codes have a higher percentage of cash buyers than others which could signal an area in transition that investors see as a profitable market. I wish you luck getting the data you need!