Unlimited Guns And Money:
Find a respawning weapons case. For example, in New Haven, there are five weapon crates that respawn every time you load the game. Three are on the roofs (above the truck stop, west staircase over the bar, and above the west gate -- jump from canopy). The repaired claptrap opens another crate behind some steel plates, and there is one more weapon crate north east behind a junk hill under a large canvas canopy. Note: There are a few bandits and aliens that spawn here. Collect the contents of the crates, quit the game, resume and collect them again. Repeat this until you get your desired weapon and sell the excess guns to get as much money as desired.