SARscape is a series of separate modules to ENVI, which will require an additional license. I am afraid that a SARscape license is typically a considerable expense. You will want to contact your Harris Geospatial sales representative or your local distributor for information about pricing, which SARscape modules you will need for the work you hope to do, and how to purchase a SARscape license. You can find the correct contact information from our Contact page on the Harris Geospatial website:
http://www.harrisgeospatial.com/ContactUs.aspx
Best Regards,
Peg