We have shopped at Publix and Winn-Dixie. Pretty similar to what I pay at home for groceries, except meat and milk higher. I read somewhere that locals think the WD is the least expensive grocery store. Not sure if includes the big Superstores. I doubt it.
I like them both, but will go to WD next week because it's within walkking distance of where I'm staying, Cypress Pointe.
You can't go wrong with either. Goodings is the skyhigh store.
herc.