How much Commercial IDSes cost?

Hi all,
We would like to purchase a commercial IDS in our institute. Anyone
can give us an idea about the price range of commercial IDS. We need
example prices of both Hardware IDS, Software IDS, Signature-based or
anomaly based. Also, the updating cost of signatures.
Replies from marketing guys as well as rough estimations from others
are welcommed.

Thank you in advance for your kind reply.
Masgad

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