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Our play grocery store was created to go with the Red Retro Kitchen
The market was made out of IKEA shoe shelves and a $6 piece of wood, cut down for back supports and shelves along with $8 worth of L brackets and $10 worth of trays and baskets from the thrift store. It's not the fanciest but it gave her lots of room to play around and certainly did the trick.
Originally I was going to make a little awning, but I was worried that it would be too much for the dining room so she has a sign made out of a dollar set of flashcards instead.
The cash register was a contribution from her dad, who popped her down to the toy store as soon as I had the play market up. I wasn't thrilled with it at first because I had visions of one of those vintage tin registers with the big buttons and the numbers that pop up, but this one has been surprisingly lovely. Eva has a lot of fun swiping her credit cards and scanning the food, so I think makes more sense to her than an older register would have.
(Note: I did originally have a money jar full of money because I thought she could have a little hippie co-op and practice counting. Yeah, that's the fastest way to get small pieces of plastic and paper all over your dining room.)
The Melissa & Doug Shopping Cart
As for play food, I still have quite a bit from when I was little, but I picked up some plastic bread, fruits, and veggies from Toys R Us because they were a realistic size and not very expensive. We've also had a lot of fun with a set of Learning Resources 1 to 10 Counting Cans
Thrifted/Hand-me-downs: wooden shelves, dishes, assorted play food, baskets, trays
Purchased/Gifts: Red Retro Kitchen