CASIO CTK-120 KEYBOARD POWER SUPPLY REPLACEMENT ADAPTER UK 9V 712221880254 | eBay
BERLS 9V Power Supply Adapter for Casio Piano Keyboard CTK Series CTK-120 CTK-330 CTK-491 CTK-515 CTK-551 CTK-630 CTK-700 etc. - AliExpress Home Improvement
Power Supply/AC Adapter for Casio Keyboards: CTK-120 CTK-431 CTK-451 CTK-471 | eBay