What TYPE AND WHERE I CAN FIND A HDD FOR THE PS3?

May be...

You'll need a 2.5" serial ATA (SATA) hard drive, the same kind used in laptops. I'd recommend a brand like Seagate that comes with a longer warranty period. A good place to buy computer hardware at a low price is http://www.newegg.com, or if you don't want to buy online places like Best Buy and Circuit City usually have a small selection of drives.