From There are four promotional unlocks in Borderlands 2. What are they?:

1. The Creature Dome from Gamestop.
2. Premiere Club(all preorders) - I presume for the purposes of this file, it's just the Gearbox Guns and Vault Hunter relic and not the free character DLC and golden key.
3. A special grenade mod(not sure what the source of this is)
4. Special character skins(Collectors Edition unlock)

1. The Creature Slaughterdome has since been made available for purchase.
2. Mechromancer Pack: "In addition to this new class, this pack also includes bonus items which were included in the Borderlands 2 Premiere Club Pack, including the Gearbox Gold Gun Pack, a Golden Key, which unlocks rare items in the mysterious Sanctuary Loot Chest, and the Vault Hunter’s Relic, which boosts your gear-hunting fortunes."
3. Contraband Sky Rocket
4. There is a Collector's Edition Pack that can be bought.

From There are four promotional unlocks in Borderlands 2. What are they?:

1. The Creature Dome from Gamestop.
2. Premiere Club(all preorders) - I presume for the purposes of this file, it's just the Gearbox Guns and Vault Hunter relic and not the free character DLC and golden key.
3. A special grenade mod(not sure what the source of this is)
4. Special character skins(Collectors Edition unlock)

1. The Creature Slaughterdome has since been made available for purchase.
2. Mechromancer Pack: "In addition to this new class, this pack also includes bonus items which were included in the Borderlands 2 Premiere Club Pack, including the Gearbox Gold Gun Pack, a Golden Key, which unlocks rare items in the mysterious Sanctuary Loot Chest, and the Vault Hunter’s Relic, which boosts your gear-hunting fortunes."
3. Contraband Sky Rocket
4. There is a Collector's Edition Pack that can be bought.

From There are four promotional unlocks in Borderlands 2. What are they?:

1. The Creature Dome from Gamestop.
2. Premiere Club(all preorders) - I presume for the purposes of this file, it's just the Gearbox Guns and Vault Hunter relic and not the free character DLC and golden key.
3. A special grenade mod(not sure what the source of this is)
4. Special character skins(Collectors Edition unlock)

1. The Creature Slaughterdome has since been made available for purchase.
2. Mechromancer Pack: "In addition to this new class, this pack also includes bonus items which were included in the Borderlands 2 Premiere Club Pack, including the Gearbox Gold Gun Pack, a Golden Key, which unlocks rare items in the mysterious Sanctuary Loot Chest, and the Vault Hunter’s Relic, which boosts your gear-hunting fortunes."
3. I don't know the special grenade mod.
4. There is a Collector's Edition Pack that can be bought.

From There are four promotional unlocks in Borderlands 2. What are they?:

1. The Creature Dome from Gamestop.
2. Premiere Club(all preorders) - I presume for the purposes of this file, it's just the Gearbox Guns and Vault Hunter relic and not the free character DLC and golden key.
3. A special grenade mod(not sure what the source of this is)
4. Special character skins(Collectors Edition unlock)

1. The Creature Slaughterdome has since been made available for purchase.
2. Mechromancer Pack: "In addition to this new class, this pack also includes bonus items which were included in the Borderlands 2 Premiere Club Pack, including the Gearbox Gold Gun Pack, a Golden Key, which unlocks rare items in the mysterious Sanctuary Loot Chest, and the Vault Hunter’s Relic, which boosts your gear-hunting fortunes."
3. Contraband Sky Rocket
4. There is a Collector's Edition Pack that can be bought.