What you would need to do is start a retail store that either:

A) Sold the product at a price competitive to the online retailers (competitive can mean price or value-add services like knowledgeable salespeople, free delivery, etc.)

or

B) Provided great advice, directed a customer to the cheapest internet price and then had a value-add service. The store would then get paid via the internet store from which the item was purchased. The problem with this approach is that after time it would be beneficial (in the short term) for the retail store to direct customers to whichever online store gave the retail store the best kick back.