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GaryCon III swag includes The Random Exotic Creature Generator by James Raggi IV, and The Cabal King by Jason M Cook and Jon Johnson; a tournament module that was supposed to be run at GaryCon II, but events conspired to keep it from being run.
For GaryCon IV, I have the commemorative GaryCon d4 (on the copy of The Cabal King) and the Castles and Crusades module Dwarven Glory by Stephen Chenault. Having never played C&C, it was an interesting read and has piqued my interest in the system.
While the main purpose if GaryCon is to play games and make friends, getting free stuff doesn't hurt either.