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Here's a bit from Google about the Search Appliance Mini (the one I am considering):
The Mini comes in multiple versions. The most affordable Mini searches up to 50,000 documents for $2,990 – including all hardware, software and two years of support. Additional versions search up to 100,000, 200,000 or 300,000 documents. Since upgrading is easy, the Mini is great for growing organizations.
Which hardware/services are you considering?