Tickets on sale this Saturday, May 2nd. I don't know price info but last year it was $75 for Jones Beach NYC.
From the press release:
Guerilla Union, the promoter for the ROCK THE BELLS 2009 FESTIVAL SERIES has unveiled the dates and venues of North America’s only major touring hip-hop festival. In addition, Busta Rhymes, The GZA and The Knux will join the previously announced stellar line-up of performers featuring headliners Nas & Damian “Jr. Gong” Marley, The Roots, Big Boi, Common and more. (Check out the full release here)
Dates:Chicago - Saturday June 27th - First Midwest Bank Amphitheatre
Detroit- Sunday June 28th - DTE Energy Music Theatre
Toronto- Sunday July 5th - Molson Amphitheatre
Washington DC - Sunday July 12th - Merriweather Post Pavilion
Boston- Saturday July 18th - Comcast Center
New York -Sunday July 19th - Jones Beach Amphitheatre
Vancouver- Saturday August 1st - Deer Lake Park
Denver- Thursday August 6th - Red Rocks Amphitheatre
Los Angeles - Saturday August 8th - San Manuel Amphitheatre
San Francisco- Sunday August 9th - Shoreline Amphitheatre
... Plus more to be announced soon. Thanks to Ashley for the heads up !!