check out Miragenetworks.com for a great solution, we just started to sell it (it is not opensource)
arguing with the cost effectiveness, just see how large companies dont prefer spamassassin (they are constantly moving to commercial software) because of the quality reliability and even costs:
developing, supporting and maintaining an open source solution is NOT free.
and imagine a NAC solution is much more complicated than spam filtering so the total cost of ownership will include even more inhouse efforts.
no intention of advertising, but its fair to listen to the other side. (I havent revied the OS NAC solutions listed here, but Mirage's
http://miragenetworks.com/products/top_ten.asp
10 questions about NAC should help You seletc an OS solution as well!
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