Here is what I got from a person who appears to have a good relationship with Sams.
Case weights are normally between about 60 and 75 lbs, the heavier the cryovacs the fewer there are in the case, the lighter they are, the more there are in the case!
So that means 4 - 6 cryo's of either Spares or Packers.
Spare ribs come in 3 pack cryo's, Baby backs sometimes in 3 packs, sometimes in 2 packs, it depends on which supplier they are using in your area.
I have a good relationship with the 3 nearest Sam's Clubs and they always allow me to inspect before I buy, the 4th nearest will allow it if the manager or his deputy is around, otherwise the workers have instructions not to allow any members into the walkins, and they tend not to be as helpful!
Spare ribs $1.58 / lb
Baby backs $ 2.81 / lb
Packer Briskets $ 1.77 / lb
Brisket Flats $ 2.77 / lb"