Amazon.com: AC Charger Cord for Casio CTK-574 CTK-691 CTK-431 CTK-800 Keyboard Power Supply Charger : Electronics
Casiotone - Wikipedia
US 9V Power Adaptor for the Casio CTK-800 Keyboard by myVolts
Amazon.com: Casio CT-X700 EDP Educational Keyboard Pack with Power Supply, Stand, Headphones, USB Cable, and Instructional Software : Musical Instruments