The only suggestion I have it to keep looking on places like e-bay. Maybe visiting some classic gaming sites like the forums at atariage.com. Maybe someone there has one that they would sell you. Usually, even the rarest of the rare will show up on e-bay eventually. You've just got to have patience, and be willing to pay the prices. Another suggestion is to try not to search too specifically. Lots of times, people who sell this stuff has no idea what they have, and therefore don't call it the right name. One used to be able to find lots of classic gaming stuff at thrift stores for dirt cheap prices. I got quite a bit of my Atari collection at those places. Today, however, its hard to find anything there. Too many collectors/e-bayers now I guess. Good luck!