Ryan, have a look at "Quandl". You can find literally millions of time
series . The futures  WTI CrudeOil front month has the symbol "CL1". You
can either download the file directly or, and this is even easier, you can
install the CRAN package ("Quandl") and do everything from within R. You
can subset the data, select a frequency even transform the data before
downloading ( normalise, diff etc.) and have the data returned in one of 4
formats (" xts","zoo", "ts" or "raw" )

http://www.quandl.com/
http://www.quandl.com/help/packages/r

Kind regards
Helmuth

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