Others that began as e-tailers-only are beginning to move into physical retailing, albeit in a lighter weight pop-up store format.

FORBES: Pre-Tail, E-Tail, to Retail: The New Commerce Pipeline

RetailWire asked its BrainTrust panel of retailing experts what they thought of the potential of the Walmart Express format as well as its impact on the competitive landscape.

FORBES: Walmart Testing Express C-Store Concept

Clearly online retailing requires a lot less retail property space compared to traditional brick-and-mortar format employed by big retail chains like Wal-Mart, Best Buy, Target and Costco.

FORBES: Property Price Problems Aside, Best Buy Cruises To $39

Any retailers who are still hesitant about including an online format should (a) re-read the January 17th Forbes blog Online Retailing on an Upward Trajectory, (b) take you head out the sand, and (c) crowbar your wallet open and allocate funds toward the website, or (d) decide to forgo sales to your competition.

FORBES: All Online Retailers are Not Created Equal