Entrepreneurs who bring in millions flipping clothes and sneakers explain how they find profitable products, including 'home run items'

Courtesy of Val Zapata

• Business Insider has spoken with entrepreneurs who buy and resell apparel and sneakers for a living.
• The key to sourcing profitable products is niching down and understanding your customer.
• As for home run items, don't expect to find them daily but, 'they are out there.'

Buying and reselling items can be an effective way to bring in extra cash — and can even be your ticket to financial independence.