I just found a new business idea online which is a retail store that has both online and walk-in stores across Lagos state.
Their prices are the best you can find. even cheaper than shoprite.

MyMart Store partners with the best suppliers in the country to provide best price on beverages, food ingredients, home products and body care and a wide variety of products

check it out www.mymart.com.ng

Mymart stores can be found on the following locations;
Ikeja
Ogba
Akoka
Unilag
Festac
other locations coming soon...

Best of all you pay online or pay on delivery at your door step.