http://www.ngccoin.com/Research.aspx has links to census report, price guide and their new "auction central" resource.
If you are looking for slab verification of NGC slabs go here> http://www.ngccoin.com/certlookup/index.aspx
I can only assume that - in regards to NGC - you want a price guide. Check numismedia.com NGC also allows online cert verification free of charge. If you want pop reports, join.
