Think about customer service; How can you beat the competition with better service? I'm not just talking about smiling and polite attendants [even though this is important], but have you seen how butcheries offer to cut your meat into cubes [ready for cooking]?
Can you improve the buying process: make it faster and more convenient?
Can you package your goods in better, more convenient, more attractive packages [remember what NSC did to sugar?]
And when you do all these, don't lose sight of the classic 4Ps:
Product
Placement
Promotion
Price
Nothing is real unless it can be named; nothing has value unless it can be sold; money is worthless unless you spend it.