Costco, American Express Partnership to End

Costco shoppers who have been limited for years to American Express credit cards may be able to pluck a new option from their wallets or purses next year after an exclusivity deal between the companies expires. American Express said Thursday that it hasn't been able to come to an agreement with Costco on renewal terms. The current agreement covers U.S. stores and dates back 16 years. It will end March 31, 2016.