I paid $90 for my pair of B's, and grade A's around here are running $200 a pair.
I have noticed with the B pairs that generally one is a little more "picasso" looking and the other is usually more "normal" looking. I have seen a couple B's that had more white on them than my pair, but I knew mine had been in the store for a while and were eating very well so that is why I bought the ones I have now.