Fresh fish, fresh meat and good frozen fish too.
Not a bad place to pick up, or, rather, pick out fresh produce in season, either. (I disapprove of the Stan's Market wrapped-in-plastic approach.) The staff is nice and they keep the lines moving, even on a busy day.
Don't neglect to get the extra ice at the checkout - a charming and old-fashioned touch that never should have gone out of style. It keeps your stuff nice for the trip home.
Foodies visiting Pittsburgh's Convention Center would do well to hike/cab over to "the Strip" to visit Wholey's and Penn Mac for lunch, dinner, a snack or some shopping, rather than exploring downtown.