Rezod: Not sure where your brother was in Hawaii, but when I was there last I couldn't go 100 yards without tripping over somewhere selling 100% Kona coffee. I was on the big island and spent time in Kona though. I am a coffee nut as well, we started most mornings visiting a coffee farm where you got as much free coffee as you could stand.
To me, 100% Kona is the absolute best, much nicer than the 10% stuff. What they use in the 90% is usually regular colombian, and that's ok, but it's often not the best beans.
But 100% kona is also expensive. There was a place in Kona called Ferrari coffee, which was started by Enzo Ferrari's brother. They had the cheapest 100% kona I found, and you can find it online.
http://ferraricoffee.com/shop/shop.php?category=Pure
It's still expensive, but if you're dying to try it... Warning, regular coffee afterward will taste...regular.