PT75's not been released (perhaps I should say "published") yet. Just checked Amazon and Cambridge ... Nope! No PT75 anywhere yet. I pre-ordered it from LSAC and it's not here (not been shipped to my knowledge).
@"Ron Swanson" i think a happy medium would be to do PT75 as an untimed BR. This way you can acquaint yourself with any last minute peculiarities but without the pressure of it being the LAST practice test you're gonna take.