There are two special sticks in the line: Special Edition, and Special Addition, each using genuine parts from one of Japan's top two arcade control manufacturers, Seimitsu and Sanwa Denshi. Typically they're available for a very limited time and then, mere weeks after release, your only hope for buying one is from an auction somewhere at 50-100% above the original $90 cost.
This is one of the special ones: the Hori Real Arcade Pro Special Addition 2. Check it out:
The price is up to $100 now, but that doesn't stop me from wanting one. A lot.