US 9V Power Adaptor for the Casio CTK-200 Keyboard by myVolts
Amazon.com: 9V AC Power Supply Adapter for Casio Keyboard AD-5 AD-5MU WK-110 WK-200 WK-210 LK-43 CT-360 CTK-496 CTK-480 CA100 CTK 573 CTK-2000, BOSS Effects Pedal, Casio Piano Power Cord Center Negative (10FT) :