I got word through twitter a few days ago that Telerik is making available to MSDN subscribrers their WPF controls for FREE!  Go and get them!  I consider Telerik controls the easiest to use and this is just great to get a perpetual license.

The word I got said this is limited until the end of July, and that you have an MSDN account.  When downloading I did not see a need to enter MSDN subscriber information (which I am a member), so try getting them while you can.