Selling a home on your home isn't easy, is it? One of the most challenging tasks of a home seller is to set the right price. You have a right to be concerned because buyers shop in price ranges, and even with homes listed in the MLS, Realtors know value. Time and resources are limited, and very few Realtors, or their buyers, are going to invest in looking at over-priced homes.
So far as finding the selling prices of homes, the public data base may not be updated in a timely manner, however you could certainly contact the county assessor's office and ask directly. Most counties websites are excellent sources of this info.
You should know what I blogged about earlier today, and that is sometimes market data on it's own is more hurtful than no data. You need interpretation of the data to make it applicable to your situation. You'd be surprised about the number of posts I read from sellers who have listed with an MLS entry -only broker, or a limited service broker, and they have questions as to why their home is not sellting...and they are paying a buyer agent fee already....so they are trying to save a few percent and are frustrated because they dont' have anyone who can help them with the key question...what will it take to sell my home?
Best of luck to you.