From prescriptions to travel discounts, your membership can save you big.

Sure, Costco is best-known as the land of bulk groceries, but consumers who focus solely on food could be missing some sweet deals when it comes to something they probably use every day: their cars.

Most people know that Costco has a range of services beyond bulk buys for your home and kitchen, but one that's not well known is its car rental service (aka Costco Travel’s Low Price Finder). The big ...