Maui County Employees' FCU continues to offer 4.00% APY on its 6-month share certificate. It's down from 5% when I first reported on this in April, but 4% is still an excellent rate for a 6-month term. The minimum deposit is $1,000.
Unfortunately, the membership is narrow even for those in Hawaii. Membership is open to various government and business employees who live in Maui County. Please see their membership page for the full details.
The office is located in the city of Wailuku. The credit union is federally insured by the NCUA (Charter # 1866). It has $180.7 million in assets and 12,244 members.