All things considered, I think you did quite well. The math often tends to get fuzzy when you are trying to get dry goods, which can go UPS Ground at one rate, and perishables that may have to go 2- or 3-day air at a considerably higher rate. Was PennMac able to package and ship everything so that the flour and cheese arrived at the same time and via the same method of shipment? Or did the flour come by UPS Ground and the cheese by air? Whatever way the cheese came, what you paid per pound was less than what I have to pay for lower-quality deli mozzarella cheese here in Texas.
Also, was the bag of flour actually 55 lbs. rather than 50 lbs.? When I saw the Caputo 00 at chefswarehouse.com, it was shown as a 25 kilo bag. As you indicated in an earlier post, just to get the Caputo 00 flour from chefswarehouse to Tampa you would have had to pay a total of $72.40, including shipping. So, by using PennMac instead, you really got the cheese for a pittance.