If you lived around Los Angeles in the 1960s, and blinked twice, you might have missed the Unimart chain. It was only in business for 13 years.
Photo from http://pleasantfamilyshopping.blogspot.com

We end our Discount Mart history section with a rendering of a typical Southern California Two Guys store; this from the early 1970s.
Drawing from the Oxnard (California) Press Courier