As a general rule, it's a good idea for retailers to offer outstanding customer service. But Costco takes that concept a step further than most.

Costco is known not only for its extremely competitive prices, but also for one of the most flexible return policies in all of retail. Buy something you don't like or whose quality isn't up to par, and with very few exceptions, you can bring it back for a full refund at any time.

Don't miss the move: Subscribe to TheStreet's free daily newsletter

Costco does other things to offer great value to members. It keeps a close eye on its inventory, while aiming to introduce new products from which customers can benefit.

Related: Costco plans new checkout option members should love

And you can bet that Costco keeps tabs on prices, too.

The warehouse

See Full Page