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

The title pretty much says it all. There is a hack going around to unlock all four of the promotional unlocks. I was wondering what exactly they are? For example, in my game UnlockId=2 is set.

These aren't necessarily in order of how they appear in the ini file, but they're what I got when I edited the file to unlock all of the bonuses.

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)