Richard Corben---iconic bronze age underground artist.
Zero convention appearances.
Roughly 25 signature series slabs out there. About 10 years ago, I did 10 of those 25. You'll never see any of these for sale online somewhere---I know most of these are in black hole collections. I still own five....here are two. Both can absolutely benefit from a press. While not everyone's cup of tea, the only people harder to get then him (alive, anyway) would be Robert Crumb and David Mazzucchelli.
SLOW DEATH #3 (1st print) CGC 8.0 s/s Richard Corben $425
Optional press and re-sub for grading- $55 optional