We have always asked for them at chekin and rec'd them. Actually, on our first trip that DD was out of the pack and play, I didn't even know they had the bedrail option. The CM that checked us in had them sent to our room and they were there before we were! We have always gotten the mesh ones.
This December DD #2 will be just short of 1, but I think that we are going to use the bed rails and let her sleep with one of us. The pack and play takes up so much room. We will be at POFQ.