Like some of you said, I'll buy a three pack of spares at Sams or Costco, trim the St Loius ribs, and then cook the whole shebang at once...riblets and all. We eat what we want, then vac seal ribs to freeze. I bought a new Weston 2300, and it does a great job of sealing the whole rib.
Then, on nights we are looking for a tasty, quick meal, out comes a St Louis slab ready, willing and able!