Sad news: Kona Scrapbooks has closed.
Good news: Island Paperie is open. Google maps is showing 2 addresses for Island Paperie. I confirmed with the store that the correct address is 395 Dairy Road, Unit A Kahului.
The store in Hilo is called Island Scrapbooking (and they seem to carry stamps.) Their location is at 223A kilauea Ave in Hilo, Hi.