Talk about good timing. I grabbed one of these prime rib roasts last year and did a two-week wet age followed by a 35-day dry age which has been the tradition every Christmas for a few years now. I just took the last cowboy-cut+ (it's probably over 3" thicc) prime rib steak out of the freezer and put it in the fridge to thaw yesterday for Christmas dinner tomorrow along with some crab legs and other goodies. Starting the process again on another rib roast for eating killer steaks during 2021. This has quickly become one of my favorite traditions.
FYI King Soopers has their prime rib roast for $5.77/lb as mentioned but Safeway has them at $4.77/lb with an "oven ready" version that's Angus and $5.77/lb. All of the aforementioned is "choice" grade.