Graphic Novel available from:

Comic Book series published December 2000, January, March, April & June 2001 as Underworld #1, 2, 3, 4 & 5 by Dark Horse Comics:

Synopsis:
A group of Hutts decide to place a wager to see who really carries the most weight throughout the Galactic Underworld. When it comes to setting a goal for this contest they decide to hire crews to seek out the fabled Yavin Vassilika -- a legendary treasure which most sentient beings believe to be fictional.
The race is on as Han Solo and Chewie search the planet Kalkovak for information leading to the legendary Vassilika of Yavin. Things get lively, though, when hardcore bounty hunters Bossk, Dengar, and IG-88 show up with a laundry list of grudges to settle! And there's nothing more explosive than bad blood between scoundrels!
It's easy to get lost on the high seas of Mon Calamari, and when you're 8-feet tall and covered with hair, that's a prospect second only to Hell... Han, Chewie, and the rest of the Millennium Falcon's passenger list scour the floating city of Mon Ubris for the man who can lead them to the fabled Vassilika of Yavin. Unfortunately his trail leads out across the vast ocean plains towards the mysterious Bank of Knowledge. Bossk and his fellow bounty hunters might want to think twice before crossing their paths, however, as there's not much meaner than a water-logged Wookiee!
There's a reason nobody ventures out beyond the Outer Rim, but that reason isn't enough to dissuade the race of bounty hunters on the trail of the Yavin Vassilika... Finally located on display in the center of a primitive village, one would think it'd be easy pickings, but that sort of assumption can get you sentenced to a bizarre and painful death, as Han and Lando find out the hard way. Sure, the natives may look peaceful, but "peace" is a relative term... one that Boba Fett is prepared to redefine for them.
Never trust a scoundrel, especially one that's smiling. As the race for the fabled Vassilika culminates in a seven-way free-for-all and a mad-dash for freedom, it's every being for himself and partners be damned! But as Han, Lando, and the rest of the competitors soon learn, the most dangerous enemy is the one you can't see...

Synopsis taken from Dark Horse, www.darkhorse.com.

Related Stories (in chronological order):

• Open Seasons by Haden Blackman et al.
• Jango Fett by Ron Marz et al.
• Zam Wesell by Ron Marz et al.
• Attack of the Clones by R. A. Salvatore
• The Fight to Survive by Terry Bisson
• Crossfire by Terry Bisson
• Maze of Deception by Elizabeth Hand
• Hunted by Elizabeth Hand
• A New Threat by Elizabeth Hand
• Pursuit by Elizabeth Hand
• Revenge of the Sith
• Underworld
• Enemy of the Empire by John Wagner et al.
• Salvage by John Wagner et al.
• Sacrifice by John Wagner et al.
• Wreckage by Ron Marz et al.
• Overkill by Thomas Andrews et al.
• A New Hope
• The Mandalorian Armour by K. W. Jeter
• Slave Ship by K. W. Jeter
• Hard Merchandise by K. W. Jeter
• Tales of the Bounty Hunters edited by Kevin J. Anderson
• The Empire Strikes Back by Donald F. Glut
• Return of the Jedi by James Kahn
• Twin Engines of Destruction by Andy Mangels et al.
• Death, Lies and Treachery by John Wagner et al.
• Agent Of Doom by John Ostrander et al.
• A Practical Man by Karen Traviss