I am not in the market, but am curious about the story behind it. There must be a reason for someone to buy an ejection seat. Were you going to restore a plane or is it historically significant? Inquiring minds want to know.
Another thought, have you considered contacting an organization that restores these planes? It may be exactly what one of them is looking for, you could shoot them an email. I remember being in one of the airplane museums in the Florida panhandle that I believe had a B52 they were working on.