I'm trying to get the Dow Jones Industrial Average 30 Components data (open, high, low, close prices) from 2008-01-01 to 2018-12-31. I tried at first Quandl, but it seems that the data was no longer refreshed starting from April 11, 2018. I then tried Alpha Vantage, but with a free account API, we are limited to 5 requests/min, so I need to wait for 30/5 = 6 minutes to get the data.
Do you know what is the best way to get the financial data?