Through a partnership with Affirm, the warehouse retail chain will offer a payment plan on some online purchases. The Buy Now ...

This is not a false alarm. Costco now allows its members to use the installment payment app Affirm when checking out on its website.

The new Buy Now, Pay Later option will also charge interest, with APR rates between 10% and 36%. A $500 purchase at 20% APR, with payments spread out across 6 months, for example, will cost $88.27 per ...