I'll always be missing that game because of france
Lol, I almost spit my drink out upon reading that.
My holy grail unattainable item would be the Elemental Gearbolt Assassin's Case. I am a huge Working Designs fan, but the prices on them now (or at least what people are asking) are beyond what I could reasonably hope to spend on one unless I got an unexpected windfall of some sort or won the lottery.
For my truly unique I will go to the Sega side of things. Several years ago I bought some Sega Pico stuff from a lady locally, and one of the things included was this odd cart called the Storyware Sampler. I forgot about it for awhile until I started to dig back into the Pico and discovered it is incredibly rare. According to SegaRetro only 3 known copies exist and I apparently have the 4th (to complement my full Pico set now).
Something unique but less lame (and Working Designs related!) would be the fact that after many years I just recently managed to finish my collection of all 14 unique Arc the Lad Collection preorder watches. Besides Victor Ireland I believe I am the only person to have a full set of them.