A usable PS3 emulator is several years away.
By usable I mean an emulator that doesn't rely on a $5000 PC and runs more than a small handful of games at a shitty framerate.
Then you have to take the games into consideration, they are on Blurays and they are quite large to download if you can even find them.
I recommend anyone wanting to play PS3 that badly to go buy one and buy the games second hand, it's extremely affordable right now with everyone selling theirs off for PS4s and XBones.