Do they have every brick type or just the basics at the PaB wall?
At the LEGOLAND California Pick a Brick wall last week (March 9th 2019) they had mostly basic brick shapes. There were some plates, some modified bricks with studs on the side, and a couple of containers had thick rubber wheels, the smallest kind. There was also a container of 1x6x6 panels in white. Nothing else stood out as particularly interesting.