His acting career had been overshadowed for many years by his battle with drug addiction.
The Hollywood Reporter noted Haim, who had recently starred in A&E's "The Two Coreys" reality series with fellow 1980's film star Corey Feldman, also was omitted from the recent Screen Actors Guild Awards "In Memoriam" segment.
A message posted on his official Web site Sunday said the actor's mother, Judy, is selling some of his personal items on eBay.
"While the mourning continues, Judy feels it is time for her to release some of Corey's personal belongings," the Web posting said. "She no longer has the space for it all and would now like to offer them to his fans. Over the next few weeks, I will be listing these items for Judy on eBay. The proceeds of Corey's snowboard and accessories from 'The Two Coreys' will be for the benefit and support of Judy. The proceeds of all other items -- T-shirts, shirts, shoes, etc. -- will go 100 percent to the Homeless Animals Rescue Team of Long Island, an animal rescue organization that saves, vets and provides long-term shelter to homeless dogs, cats and other companion animals in need."
The actor was living with his mother, who has breast cancer, at the time of his death.