Google Site Search Offers A Simple Pricing Scheme, Across The Product Line.

If you are using Google Site Search, good for you because in addition to all the benefits like:

Increase website conversions and sales
Reduce support costs by enhancing self service
Display ads-free search results
Customize search box and results using XML
Optional Google branding

now you have "Flexible pricing model based on search queries". This comes after Google carefully considering all your feedback, actual product use and Google's idea of making a good product better.
So from now on, Google will change the way it used to charge for Google Site Search (it used to be charges were based on both the number of submitted search queries and the number of pages indexed.)

Now it is only the number of queries submitted your Google Site Search engine per a year. As you can see from the table below, the scheme spans all sort of users, from smallest to the medium sized business sites querying half a million times. If you plan to query more than that, better contact Google sales. You can learn more at Google Site Search