I bought a used ps3 slim 160gb for $30.00 and found a guy online (I forgot where) that downgraded to 3.55 and installed Rebug 4.75 for $45.00 and I had to pay to ship it to him and back for a total of $25.00
so I guess overall, I paid $100.00 for mine..
and im about to get a 3tb external hdd ($89.99) to back up my games, movies and music