Shop Unlockables (By Deck of 52 Verification)
Cheat Supply - Unlock the cheat weapons supply crate by verifying all Deck of 52 targets. Note, this may be lethal or non-lethal verification, but you will need to finish the game at least once to unlock this supply drop since you need to verify General Song. If you want quick access to this item, enter the PDA screen, scroll to the faction status menu and use the D-pad to input Down, Down, Down, Down, Up, Left, Right, Right.
Add $1,000,000 To Your Account
If you need the money to buy stuff, enter this code as well (same menu): Right, Down, Left, Up, Up, Left, Down, Right. The $1,000,000 should get you off to a start. This code adds up if you do it repeatedly.
Invulnerability & Infinite Ammo
When you want to say, "Just fork this schnit", here's invulnerability and infinite ammo. Note the degreelessness mode does not extend to gunners or passengers -- vehicles your merc is not operating can be shot up when you leave it. Enter the PDA screen, scroll to the faction status menu and use the D-pad to input the following:
Invulnerability - Up, Down, Up, Down, Left, Right, Left, Right
Infinite Ammo - Right, Left, Right, Right, Left, Right, Left, Left
The invulnerability code turns off each time you see a loading screen. Just enter the code again to reactivate it. One last thing about these two cheats in particular -- turn them off before you save your game, or you'll be sorry.