Customers requiring postal services can use the Self-Service Kiosk (SSK) available at select Post Offices. The ATM-like kiosk, which accepts debit and credit cards only, can handle 80 percent of the transactions conducted at the retail counter such as buying stamps, mailing a parcel, or shipping an urgent letter or package by Express or Priority Mail. To find SSK locations, customers can go to www.usps.com.