They are terrific. I've had them make them to my specs on the spot, but they were in the middle of a batch so it was no problem. I had them do 1/8lb balls, great for individual portions. Normally the burrata is in 1lb size.
Costco in Marina del Rey had them a couple years ago, at least, in individual plastic tubs of liquid in the open-top refrigerated area. Might be worth trying another Costco. These were cheap for what you got and quite good.