It depends a bit on yor financial situation, but often they may work with you.
You may say something like.. Its probably worth 500 , I could only give you 300 right now. And sometimes the owner might say something like Oh well, That Much!!.. I would be happy with 200.00.
So you never know, but I will say this.. if you have to wait a bit to pay or are even getting it later in the week..dont tell anyone anything specific about it... because things like that have a habit of disappearing under you nose when you tell people..
That being said, there was a bar in town that had a clock I liked.. it just closed after about 60 yrs. The clock behing the bar was what I wanted.. had a local jewellers name on it.. clock was there for at least 35 yrs that I remember. Closing week was very busy and rumor was place was to be sold with contents. It closed on a Sat nite, Mon morning i went past and saw a guy loading stuff up.. certain stuff is owned by lotto, beer co etc. He said we are closed I said I know, but is the owner(former) around. Just then a guy I kew walked out, he said the owner would be there in 1/2 hr, I told him what I was after, and left.
About 2 hrs later I went back and walked in the part they were in, owner and the guy were sitting down, I told him I was interested in the clock and he says we are supposed to leave it intact. I say well I thought you may sell it for a good offer, he says How much?..So I say how about a 100.00 He says If I could sell it to you I would sell it for 5.00... !!
He says go look at the chair over there and it was sitting there!!, he says I guess I might let it go.. So I say 5 bux.. how about 20.00.. he says sure.. and off I went!!
For months I thought of offering 150 or 200 but was worried that he might say someone would pay more...lol..