3M 9V 1A 5.5*1.7mm AC DC Adapter For CASIO-Compatible CTK-495 CTK-496 CTK-500 CTK-501 CT-20 647 395 390 637 Keyboard - AliExpress
Amazon.com: Compatible/Replacement Casio DC 9V / 9 V Volt Adapter Power Supply Cord and Plug AD-5, AD-5E, AD-5MLE, AD-5MLE-TC1, AD-5MR, AD-5EL, AD-5MU, AD-5GL for Casio Keyboards/Digital Piano/Synthesizers : Musical Instruments