Due to the highly speculative nature of  variant cover comics, I charge $5 per comic for signatures the following comics:
(No charge for these signatures if you have your comic personalized to you)

All-New Deadpool#1
All-New Wolverine #1
The Amazing Spider-Man: Civil War II #2
Ant-Man #5
C-3PO #1 (one shot)
Captain Phasma #1
Carnage #1
Deadpool #250/#45
Deadpool versus Thanos #1
Deadpool: Too Soon #2
Dr Strange: Mystic Apprentice #1
Extraordinary X-Men #1
Extraordinary X-Men #8
Groot #1
Guardians of the Galaxy: Dream On #1
Gwenpool Holiday Special #1
Hellcat #11
Marvel Two-In-One #1
Maximum Ride #1
The Mighty Captain Marvel #1
Peter Parker: Spectacular Spider-Man #1
Punisher #1
Rocket #4
Rocket Raccoon and Groot #1
Secret Empire #1
Secret Wars: Civil War #1
Secret Wars: House of M #1
Silk #2, #3, #14
Spider-Gwen #4
Spider-Man/Deadpool #5
Spider-Man: Renew Your Vows #3
Thor #8
Uncanny Avengers #5
Vader Down #1
Venom #6, #150
X-Men Prime #1
Zombies Assemble 2 #1
(and other variant covers yet to be listed)