Citigroup mistakenly sent some active Costco Wholesale members an email telling them their memberships had lapsed and their new co-branded Costco Visa accounts had been closed. The Costco Visa card ...

Costco and Sam's Club each offer their own branded credit cards that members can use to maximize their cash back. Here's how they stack up.

Are Costco's financial products actually good deals? Some are excellent — the rewards card, travel packages, business services. Others fall short. Here's what deserves your money (and what doesn't).