How do I download a stock price in Excel 2013? Is there an equivalent to Google Doc's GoogleFinance spreadsheet function?

You can use a UDF like this -

Option Explicit

Public Function GetTickerPrice(ByVal ticker As String) As Double

    Dim IE As Object
    Dim pageData As Object

    Set IE = CreateObject("InternetExplorer.Application")
    Dim URL As String
    URL = "http://www.msn.com/en-us/money/stockdetails/fi-126.1." & ticker & ".NAS?symbol=" & ticker & "=PRFIMQ"

    IE.Navigate URL

     Do Until IE.ReadyState >= 4
            DoEvents
     Loop

     Application.Wait Now + TimeSerial(0, 0, 5)

     Set pageData = IE.document

     GetTickerPrice = pageData.getElementsByClassName("precurrentvalue")(0).innertext

     Set IE = Nothing
     Set pageData = Nothing
End Function

Now you can use GetTickerPrice("GOOG") and get the current price.

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I did take this over to Codereview.SE for some input.

There are four Stock apps in the Office Store at the moment. Two of them are free :

Stock Connector

Stock Tile