Amazon Cash users can now add funds to their account balance at selecte Coinstar kiosks. There are no fees for adding cash, Coinstar said on its website. The service is already available at some Coinstar kiosks and the rollout will continue for the coming weeks.

Amazon Cash enables customers to shop Amazon.com without a credit or debit card.

To add funds to Amazon Cash, users select "cash services" on the Coinstar home screen, then enter the phone number associated with their Amazon account. They can then insert between $5 and $500 worth of bills in the cash acceptor. The funds are immediately added to the user's Amazon Cash balance.

Users also can add to their balance by providing their mobile phone number to a cashier or have a cashier scan their barcode, according to the Amazon website.