Where can I find another main cord for my ps3 ( the one that plugs it into the wall )
GameStop, they have used cords. I bought my av cables there for my Xbox 360. I'm pretty sure they'll have a cord for ps3.
Try Radio Shack.
I got mine off Amazon(: They're fairly cheap.
Almost any store Walmart, Best Buy, Amazon, GameStop, etc you might even have one hidden in your house