The Lost Boys star died of a suspected drug overdose in Los Angeles on Wednesday (10Mar10).
His family members revealed they were struggling to gather enough money to fly his body home and began selling the late actor's possessions on internet auction site eBay.com as a way for fans to donate to funeral costs.
Executives at Startifacts, the company helping to sell Haim's belongings online, subsequently offered to hand the actor's cancer-stricken mother, Judy Haim, a $20,000 (£13,300) cheque ahead of the memorial - instead of making her wait for all of the money to come through once the online auctions finish.
However, the matriarch tells U.S. TV news programme Access Hollywood Startifacts bosses have not yet provided the funds, and she has accepted an offer from Toronto officials to pay for burial expenses.
Haim will be buried in Toronto, Canada on Tuesday (16Mar10).