The new business edition of custom search comes with a sliding scale price tag, the Google site details.
According to the site, Custom Search Business Edition is available in a number of plans:
Search less than 5,000 web pages: $100 per year
Search less than 50,000 web pages: $500 per year
Search less than 100,000 web pages: $850 per year
Search less than 300,000 web pages: $2250 per year
Optimising Digital Marketing Campaigns with Search, Social and Analytics
At SES London (9-11 Feb) you'll get an overview of the latest tools, tips, and tactics in Paid, Owned, Earned, Integrated Media and Business Intelligence to streamline your marketing campaigns in 2015. Register by 31 October to take advantage of Early Bird Rates.