Thirdeye, I too buy only single racks of cry-o-vac ribs for the same reason. The creative packing of three racks is just like how some companies package their bacon by having that piece on the back side of the package which has those two flaps you can lift to see the slice that is SUPPOSED to resemble what the rest of bacon looks like. Most of the times I have opened a package such as I described, the representative piece is the only piece that looks like that.
As to the Sam's Club back ribs issue with the nubs, I had that problem at a BBQ contest in my early years. When it came time to slice up the best looking rack to sample, the nubs were cut so close to the spine, I could not slice the rack without ruining the appearance. I did not open the package until after the meat inspection. What I do now if I inspect a single rack in the package and see the nubs, I will freeze the rack. Once frozen, I will take my (meat only) reciprocating saw with a sterilized blade and cut down the rack removing the nubs. I find it is easier to do the trimming when the meat is frozen and it is easier to remove the bone/marrow dust while it still frozen. I will then rewrap the ribs if they are going back into the freezer or thaw them out for cooking.