The Invisible Market was the criminal trade that went beyond the black market. Little was known about it, except that Lannik Racto sold numerous assassin droids through the market. Slaves were also sold on the Invisible Market.
General Grievous' mask may have been bought in the Invisible Market for artistic purposes by Grand Admiral Thrawn years after the Clone Wars.
- A Guide to the Star Wars Universe
- Galaxy Guide 6: Tramp Freighters
- Galaxy Guide 9: Fragments from the Rim
- Dark Empire Sourcebook
- Star Wars Gamemaster Handbook
- Han Solo and the Corporate Sector Sourcebook
- Galaxy Guide 11: Criminal Organizations
- Cracken's Threat Dossier
- Gundark's Fantastic Technology: Personal Gear
- The Far Orbit Project
- Hideouts & Strongholds
- The Story of General Grievous: Lord of War on Hyperspace
- Underworld Appendix: Swoops, Spice, and Wretched Rogues on Hyperspace
- The Complete Star Wars Encyclopedia
- Fly Casual