I live in a suburb of Chattanooga, Tennessee.
In October of 2006, the supermarket closest to my house - which is a Bi-Lo Supermarket - built a new building - I don't the square footage, but it is LARGE. They already have it slated for an expansion to upgrade it to a 57,000-square-foot supermarket. They are also breaking ground for another 57,000-square-foot supermarket about 5 or 10 minute from my house.
http://www.bi-lo.com/bilo/index.jsp
This is - I think - typical of supermarkets here in the USA. 57,000 Square Feet holds a LOT of products and choices!
BBWCHATT
The old lady in Chattanooga, Tennessee, USA