The pricing is a different story. If you make a Linux distribution (such as the one produced by Red Hat), you are...
free to charge for the software -- and in many cases you'll see that professional (high-priced) distributions deliver some additional tools, offer support and updates or have better integration with other platforms. Having said that, you ought to compare the offerings, because there are many free (as in beer) distributions available that might perfectly suit your needs. So pricing can actually start at $0.
Editor's note: You may also be interested in reading this expert response about the difference between open source and open standards.
Related Q&A from Brenno De Winter
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