Bill, there are so many questions that accompany I sale of a used keyboard. It could be one year old and be in terrible shape. Or nine years old and still a lot of life left.

If you believe the keyboard still has a lot of life left advertise it locally – have them see and hear before they buy; this should bring you a better price. Sight-unseen and shipping and PayPal will always bring a lower price. $300 to $400 does not buy much of a keyboard in today market. I would price it at $800 if it is what you say it is.

Keyboard and speaker system combo should not sell for $300 – at that price I would buy it myself and put it in the closet.
John C.