How much is this Xbox 360 worth?

120 GB Hard Drive

Games Downloaded onto Hard Drive
Assassins Creed 2
COD Black Ops
COD Elite
COD World at War
Crackdown
Dead Pixels
Doritos Crash Course 2
Gears of War
Grand Theft Auto 5
Halo 3
Halo 4
Harms Way
Iron Brigade
Minecraft
Rainbow Six Vegas
Saints Row 3
World of Tanks

Game Discs

Battlefield 4
Call of Duty Ghosts (Disc 1+2)
Call of Duty MW3
Dead Island Riptide Special Edition

Includes DLC Content for Several Games

Selling Xbox 360, Hard Drive and all games, 4 Controllers (3 rechargeables, 2 battery required, dock for rechargeables fits 2), includes Internet and 2 Profiles (one with Gold, the Other Standard)

NOTE: Will the buyer still be able to access my credit card if I delete my credit card?

Your console will at least cost $250-$300. And no they will not see your credit card after deleting.