I am offering some CGC graded Signature Series comics for sale on the CGC message boards.
Fantastic Four 223 graded 9.6, signed by Bill Sienkiewicz
Fantastic Four 229 graded 9.8, signed by Bill Sienkiewicz
Groo The Wanderer 1 graded 9.6, signed by Sergio Aragones - with CGC label error: says “Groo Chronicles #1″
Scans and more details here.