Shady Sam is a NPC present at the Prison Hideout.
Upon interacting with Shady Sam he will say this sentence: "What'll it be?".
The options available are: "How do I use this stuff?" for explanation about equipment he sells.
The second option is "I need some supplies" - upon clicking this option it will show you the equipment he sells.
The third option is "[Leave]", which will exit the dialogue.
Skeleton keycard is used for going past the security doors present at the bank, which block you from entering the vault. It costs 200$.
Lockpit Kit allows you to break into locked safes, that are present in the vault. You may buy 3 lock kits at a time, and they cost 50$ each.
Plastic bomb allows you to open(explode) vault door, cost:500$