The tax assessor's office may have records of what they valued the property to be. Some places list every home for years, you may get lucky with an online search.
A realtor could locate records of sales in the area possibly.
Any neighbors that were there could give a letter of the value of their house.
It is recommended an appraisal be done within 6 months of the passing. You might be able to find an appraisers office that did it or could possible give you a rough idea based on other appraisals in that area at that time.
If the IRS conducts an audit, they will want to see how you made a reasonable decision for the basis listed on the tax return.
@catbill
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