Besides junk food, the other thing I looked for at Trader Joe's was cheddar cheese. In most of the standard supermarkets, like Target or Walmart, decent cheddar cheese was either expensive or not sold (respectively). Target actually sold Irish products, whether butter or cheddar cheese, but it was as I said expensive.
I don't remember what any of these were like. I think one stood out as having a mature cheddar flavour, and the rest were lacklustre.
Black Diamond vintage reserve cheddar cheese
Seaside rugged mature English Cheddar
Carr Valley Wildflower Cheddar Cheese
Trader Joe's English Coastal Cheddar Cheese