UPBRIGHT AC Adapter For Casio CTK-510 CTK-511 CTK-519 CTK-520L Keyboard Power Supply Cord Charger PSU - Walmart.com
Amazon.com: MaxLLTo 9V Power Supply Cord Charger, 6 FT Extra Long Replacement AC Adapter for Casio Keyboard CTK-500, CTK-501, CTK-510, CTK-511, CTK-515, CTK-518, CTK-519, CTK-520, CTK-520L, CTK-530 : Musical Instruments
Casio Keyboard CTK-511 Electronic - Battery or 9V Power Cord (Tested & Works) | eBay