Carrefour Market

A very busy market, and our first visit into a grocery store while overseas. The bakery items (bread, croissants, lots more) were fresh and ready to grab and go. There was plenty of beer and wine to choose from (inexpensively) and along with meats, and cheeses all the usual items you'd find in most grocery stores here in the States.
The produce looked fresh, there was good selection of frozen foods and though the store was busy, the line moved fairly quickly.
You bag it yourself here, so it doesn't hurt to carry a bag of your own while visiting, or grab one of their reusables cheaply to bring back to the US with you as a souvenier of your overseas adventure.

It's close to Gare de Lyon and Novatel Paris Gare de Lyon. It's a great place to pick up juices, sandwiches, and fruit for your hotel. It open until 10pm most days.