Find yourself a product that Mega-marts and Super Home Centers can only sell part of the selection.
Ever go into a Home Depot and get help from someone who knew anything more than you already did?
Become and expert and let the public know your an expert. Give the Customer Service unheard of at Target, and Walmart. Don't compete with them, use them. Rent a Store as close to them as you can, with a product and service they don't have. Use their customer traffic to promote your business.
Go into any Mega-Mart and ask the clerk to find a book on writing a blog. Yeah right, good luck.
If you want a special item you need to go to store that specializes in just that line of products.