Price history on Walmart.com for
PKPOWER 9V AC DC Adapter Charger for CTK-4000 CTK-558 Keyboard Power Supply Cord
See on WalmartProduct info
PKPOWER 9V AC DC Adapter Charger for CTK-4000 CTK-558 Keyboard Power Supply CordSpecifications: Brand: PKPOWER Input Voltage: AC 100-240V 50/60Hz Cord Lenth: 6.6FT(2m) Quantity: 1 Unit Power Adapter
... read more.