Aloha meimeichi! It can be tough to save here in the islands but possible.
I don't know of any double/triple coupon grocers in Oahu and Kmart doesn't double here either. Prices are a few sheckles higher (okay sometimes 10-30 cents higher) on sale items so savings aren't as great as the mainland. I can't see myself not using coupons and I have lived here all my life. Keep in touch and I can give you more info and shopping in hawaii. I used to have a blog but I ran out of gas, hoping to start it up again with all the inspiration I get here at AFC. The only national grocer we have is Safeway.