[lhorie]

Trader Joes has a pretty wide presence across the country (in 43 out of 50 states). And while they're not supermarkets per se, Walmart and Target have also got into groceries in recent years. There's also Costco in a similar boat.

[degenerate]

Trader joes is the best example of homogenous because they sell mostly their own brand cross-country, so local stock doesn't dictate what is available on the shelf. The prices remain static across most of their stores as well (for most items) which is a HUGE reason why New York and Cali folks love shopping there.