A John Lennon album he signed for his killer Mark Chapman hours before his death, on sale for $525,000 (£305,000), has attracted several potential buyers.
The LP, signed five hours earlier, was found near the shooting scene
The current owner of the Double Fantasy album found it outside Lennon's New York apartment after Chapman shot the former Beatle in 1980.
Autograph dealer Moments in Time said two possible buyers from the US and two from elsewhere had come forward.
"The response has been mind-boggling," president Gary Zimet said.
The album bears Chapman's fingerprints and was used as evidence at his trial.
Mr Zimet said the current owner was a lifelong Beatles fan who struggled to come to the decision to sell.
The album was recorded by Lennon with wife Yoko Ono
"It started as a straightforward, first-come first-served retail
sale but, if these negotiations don't work out, it's possible I
might switch to an auction process," he said.
The Moments in Time website received 85,000 hits since the sale was announced on Friday, Mr Zimet said.
The LP, which Lennon recorded with wife Yoko Ono, was the last he produced in his lifetime.
Millions of people saw the artist sign Chapman's copy in news footage and photographs after the killing.
Chapman, who was sentenced to life in prison, was denied parole for a second time in October 2001.
He claimed he was told to shoot Lennon by a voice in his head.
Christie's auction house sold a copy of Lennon's
handwritten lyrics to the Beatles song Nowhere Man for $455,000 (£265,000) last month.