This is still not an official release and the controls are currently offered for free.
For the official version that will be released when the MSSilverlight2 become official (probably end of summer) the price for the developer license most probably will be as the rest of our single suites - $999. The official version will include all the controls needed to build LOB applications - this includes Grid, Scheduler, Editor, Charting.
Do you think this is a good offer?
the Telerik team