This listing is for a used Casio MZ-X500 61-key workstation keyboard in fully working condition. It is a practical option for players looking for a workstation-style keyboard for home use, composing, practice, or studio setup, while keeping condition and value in mind. Free shipping is included, which may help when comparing similar keyboards online. Since this is a pre-owned item, buyers should review the description and photos carefully for cosmetic condition and what is included with the sale. The 61-key format may suit shoppers who want a more manageable keyboard size than larger models. Check the listing for full details. Casio MZ-X500 61-Key Workstation Keyboard – Fully Working – Read Description. Condition: Used. Listed at 649.99 USD. Up for sale is a Casio MZ-X500 61-Key Workstation Keyboard in fully working condition. Casio MZ-X500 keyboard. The battery cover is also missing. However, the DC input jack is missing the internal plastic sleeve.