Heres some good weapons to find.
Fast H11: on the first level, when your falling down on your parachute, navigate to the side over the people onto the rock and you'll an H11.
Air taser(The coolest weapon in the game):exit the main area through the cave, but keep going forward past the shotgun, over the hills until you reach the ledge.
Take a right to the next area and you'll find a big rock on a ledge. Go on the right side, Neal down and climb down the ledge. The air taser will Be there.
(I suggest doing this before you go to meet Chance.)
We have more cheats and tips for this game here, Syphon filter 2 cheats
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