Lexus are no different, I went in my local lexus dealer, all I wanted was the cover that fit's inside the latch hole where the locking clip fits from cover that's between the fronts seats because after I had fitted the OEM armrest from an Auto, the only bit missing was the cover about 50p's worth, the reply from the spares man was 'That'll be £35 please as it only comes with the centre consul, I didn't bother answering just walked out.
The moral of this story is 'Lexus are no better than any other manufacture'