You can, but my experience suggests that it is better to choose an inexpensive but reliable source.
I use Dataform for EOD commodities, and have been for several years. One year of EOD is $125. The data comes with its own charting software, but can be used easily with other charting packages such as Supercharts which I use.
If interested email Phil Nery ([email protected])
Give me a mention (Phil in England). I am not on commission, but have struck up a good rapport with Phil over the years.