Your best bet is to go to a local Electronics store, which for me would be Best Buy (and if that fails Circuit City) ask them for mic's for your PS3, and see what they got. The mic I was using was USB, so you might be able to use USB for your PS3's but I wasnt told if it was specifically for PS3, or both that and Computer.
On those few games, yea they were pretty awesome to play, my skills are still lacking, and good god was it kinda lonely talking to myself, you all need mics. Good thing my bud Cam was there with me, laughing at me getting shot in my arse. Still, that one game on the ship was total shit, almost lost my nerve with that.