You don't have to worry about Cost Basis until you sell the stock and receive a 1099-B. When you get that info, save it until you do sell, then you can use that Cost Basis to report the sale (which will be reported on Form 8949, and Schedule D).
In the TurboTax interview for a Stock Sale, if the Cost Basis on the 1099-B is missing or incorrect, check the box indicating that and on the next page, enter the correct Cost Basis. You can look up historical stock prices for most stocks on Big Charts, if you know the stock symbol.
It sounds like now all you're reporting is the income from a 1099-DIV.
@ritaburd
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