Google Site Search pricing

Google Site Search has the following options available, depending on your estimated query traffic on your website:

Google Site Search pricing

Search query limit (annual) Pricing (annual)
20,000 $100
50,000 $250
150,000 $750
500,000 $2,000
500,000+ Contact sales

You can sign up at http://www.google.com/enterprise/search/products/gss.html and pay online using Google Checkout.