There is/was a shop at Fort Street Mall that carries crafted items. That's a possibility.
"The Islands' Best" at Ala Moana--call first and ask, they might know of a place.
Also a shop at Ward Warehouse that sells Hawaiian crafts--sorry can't remember the name, but it's at the lower end.
How about Dole Pineapple place on the way to the North Shore? Call them.
I would have thought IMP would have them.
Ask around--Bell guys at the hotels know everything! Good Luck, but is this the way to spend your last hours in Hawaii?