Rob Bell (maybe signed as Bobbie?) $1
Kent Bottenfeld has actually sold for up to $15 on COMC, but is currently listed at $8.
Liniak $2
Escobar has sales on COMC up to $5 and is currently sold out.
Nick Johnson $3.
And yes, Topps, UD, Leaf, etc have all been hit by people having their family members or agents signing in place of them. I have a thread on here somewhere about it. Recently someone forged two different player's names on the same "Witnessed by a Topps representative" card.
https://www.blowoutforums.com/showthread.php?t=1525983