Tannehill,
I cook exclusively with BB and have been buying them monthly for the past 12+ years. They have been about the same price the last 5 years it seems. Sam's is the best price by far and I paid $3.84/lb yesterday. That equates to $8.60/slab. (2 1/4 lb. slabs).
Now, if you are trying to compare to a restaurant rib, you have to take into account that most restaurants do not serve 2 1/4 lb. slabs! I think more like under 2 lbs. and maybe even under 1 1/2 lbs. These ribs, in most cases, can only be bought from a meat packer or restaurant supply biz and subsequently are a little pricier on a per pound basis, but they come in the correct size for serving.
I looked at all this stuff when I was going to open a Q joint and I was quite surprised by it. I also came to the conclusion that when opening a Q joint, ribs are NOT your money maker! Locally, I could get away with charging about $18/slab. That is less than a 100% mark-up (not enough!). Whereas, pulled pork and beef sammiches were over 400%.
Anyway, not even sure if this is what you were looking for!