Ac Adapter Charger Cord Cable For Casio Wk-1250 Wk-1300 Wk-1350 Wk-3700 Keyboard - Newegg.com
This is great! Casio WK-3700 synth keyboard with DSP and ZPI processor - YouTube
Amazon.com: MaxLLTo 6ft Extra Long AC Power Replacement Adapter for Casio WK-110 WK-200 WK-210 WK-3700 Keyboard Charger Power Supply Cord : Musical Instruments