Selling?

I just had an unsolicited offer to buy my CJ 350. He wanted to drive down from the East Coast and pay cash. No price was mentioned. The next day he ask and I told him $6500. I thought this was quite low but I am getting old and have moved into an apt. He was shocked and said that he had seen many for $4000 and one for $3800. Now I have been in audio since 1960 and have a good idea what things are worth. I did not believe this for a minute. Looking on the net I found only one and it was $8724. So if you don't know yourself check with the bluebook before you sell. I told him to buy one of the cheap ones he talked about. So beware of lowballs.