rare games

From Jason & Nicole Hartley <xxxxxx@mac.com>
Date
I'm curious as to what are some of the rarest games released in the US? 
I've never come across a US version of Super Air Zonk and Dynastic 
Hero, and maybe once seen a Dungeon Explorer II. It's easier to get a 
copy of Magical Chase or Bonk 3 then those. New Adventure Island, while 
not terribly difficult to get, seems to be fetching a higher price then 
I remember.
Another game I've never even heard of is World Sports Competition, 
there's one up on ebay now.