Living in hawaii and paying for shipping is atrocious, 20 dollars for something small like a harddrive or psu and upwards of 80-100 dollars for a case or monitor.
I live in Hawaii as well and shipping is a pain from most places. Generally, I do my looking up and comparing and choosing at newegg, then when I figure what exact part I want, I find that item on Amazon.com. For the most part, they are about the same pricing, sometimes more expensive, sometimes less. But, Amazon (Amazon themselves, not the stores that also sells through Amazon) ships for free to Hawaii (and everywhere else) if your order is over $25. Also, if you pay $35 yearly fee(I think) and join their club, shipping is always free. You can buy little $2 items and have it shipped for free and I think many things are even bumped up to 2 days shipping as well under that club deal....(I am not in it), anytime I order anything it is always over $25 without me trying and the free shipping is usually at my doorsteps (actually mailbox since they use USPS) in 5 days. You can also upgrade it to 2 day shipping for far less then newegg charges. I don't worry so much about cost of shipping for HDD's, last one I got from newegg (amazon wast out of stock for one I wanted) was $18 for shipping. Which beats going to bestbuy (if they even have it) and paying $140ish for the same drive and then tax. The stuff that I always buy through Amazon or online sellers that ship USPS if Amazon doesn't carry it are computer cases. Amazon will ship computer cases for free to Hawaii and places like Peformance PC's will ship via USPS which is generally @ $40 for a full tower case...which beats newegg's $80+.