Release I would see Costco still moving these fast for under $40 / 2 doz. ( add $7 to the manufacturer and $3 to the Costco 15% margin ). Not over $30/doz, where there are just too many nice golf balls available at that price.
Do you not see Titleist, Callaway, Bridgestone, and all others, lowering their prices because of the competition? They'd have to.
For the wholesale price these would be going for, Costco would have to go higher than their normal 15% in order to be a distributor; there would be a MAP price, imo. Would they handle them at that point? If so, why buy them there if you can get them at the clubhouse for the same price, unless(Costco) members get discounts not directly reflected to the product? I don't see them handling them at all if this should come to pass. They would not be sole distributor as their stores are not everywhere.