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The usual practice is to not list prices in articles. Putting the price in tends to give the appearance of advertising. It should be mentioned, however, that the zero-cost version of Opera is adware, and that the advertising can be removed for a registration fee.
As far as the availability of the source code, I think it should be in any article that deals with software available for free (libre)/open source operating systems, as this information is often important to people using those OSes. Where it is in the article doesn't seem like a NPOV issue to me, though (unlike the Norway - whaling example). I would say that it should be put in the paragraph that states Opera is available on Linux. --STG