Costco Travel can offer strong vacation deals, but its limited options and member-only rules mean it’s best suited for certain types of trips.

There's a large group of Costco members who are finding out that they're not using their memberships to its fullest potential, here's what we know.

You can book entire vacations — airfare, hotels, meals — through Costco, and save a ton of money. Here's what you need to ...