Di Bruno cheese shop in the Italian Market has cheeses you don't easily find.
Claudio Mozzarella, a few doors down from Di Bruno Market. eat the mozzarella while walking down the street, then go back for more. 922 S 9th St, Philadelphia, PA 19147.
fabulous burrata as well.
incredibly inexpensive for the quality.
the 9th street market shops are closed Sunday.