I just realized I could get this from a colleague, so I was able to do that. I'm still curious if they are located somewhere, if anyone knows.
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You should be able to find the 8.0 data sources in the Tableau Repository (C:\Program Files (x86)\Tableau\Tableau 8.0\defaults\Datasources)
Hope this helps!
Thanks Tracy. I had copied over those files with the Beta datasources (I did this myself, as I thought I would be able to use them in 8.0). I was looking to re-download them again, but the problem is solved now.