My local Costco in Portland, Ore. -- never a store to be on the forefront of stocking anything interesting, pizza-wise -- surprised me last weekend with some Italian mozzarella di bufalo. It was right in with all the other specialty cheeses. Brand name is Garofalo, as you can see from the package photo. Price was in the neighborhood of $12/lb., as I recall. One nice feature is that the four 125g balls are packed in separate plastic bags, so you can use one and the others retain some freshness. I tasted it yesterday, both fresh and melted (not on a pie, but planning for this weekend), and it was good -- creamy and rich. I don't have much to compare it to, however, so I cannot offer any further review. Tasted very good to me.