Additional Ways to find Property Last Selling Price

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Greetings. I am looking to invest in a property that is outside of my local area. I'm currently running comps on recently sold properties in the area, but am unable to find the selling prices of these homes. I'm not a RE agent and do not have access to the MLS, and unfortunately, the county tax assessor office does not have this information available online.

Does anyone have suggestions for additional ways to find the last selling price of a property other than going to the tax assessor's office (again, I am out of the area to go there physically), Zillow/Trulia and the MLS? Thanks.