TEAMHEADKICK finds an unlimited purple (rare) weapon glitch in sanctuary for Borderlands 2. This chest can only be opened with a golden key, but we were able to open it again and again for massive damage weapons, and unlimited money. BOSS. Hope it works for you as well! Start a 1 Player Campaign and head to Sanctuary, then invite someone with a Golden Key, and have THEM open the chest, take the weapons out, and have THEM open it again. It is unlimited, and still works as of 10-2-12. The weapons will be level appropriate, so ideally you want a high level to do this for ya.
 Borderlands 2 by @teamheadkick){kind=link}