I used to scam Best Buy so hard when I worked there in High School.
The employee discounts on some items were insane. When I found a good target that I built a good report with, I'd tell them I can save them like $80 or whatever on that item if I just bought it myself and they could tip me a $20 for it. Raked in tons of cash that way.
Also, people would get so mad that Geek Squad windows re-installs would cost them like $300+. If they were cool, I'd tell them I'd do it for $100 and can do it at their house. Fixed a bunch of peoples computers.
I used to steal Ram from display models.
Also, I used to sell a ridiculous amount of Geek Squad services to people by breaking down the prices in small chunks. So instead of being like, "Ya we are gonna charge you $400 to do stupid shit" I'd be like, "$75 is for x, $100 is for X, etc etc." I'd just hope once they hit the register they didn't lose their mind. I raped so many people this way.