Costco members have access to a decent Citibank credit card. Details are here: https://www.citi.com/credit-cards/creditcards/citi.action?ID=citi-costco-credit-card-conversion
Neither card has an interesting signup bonus, unfortunately. (Both do offer 7 months at 0% on purchases. That makes these cards good candidates for conversions/downgrades from other citi cards. I don’t know how easy that is to do, but there appear to be data points about Citi letting that happen in at least some cases.
Two things are noteworthy about both flavors of card. First, both now have 24 month extended warranty protection–even when the product wasn’t bought at Costco, and even if the original warranty was less than a year. That’s fantastic protection, beating every other card that I know of.
Second, both cards offer 4% back on gas,at Costco as well as at other retailers, up to $7K a year. No other card I know of has a bonus for Costco gas.
There are two key differences between the cards…and if anyone can find others, I hope you’ll list them here.
First, the business card does NOT report to your personal credit, while the personal card of course does.
Second, only the personal card offers “CitiRewind”, citi’s price protection feature. That’s a big omission for the business card.