Once you have discovered the Church and the Warehouse and are in the City, go to the Warehouse and get the Hammer and Baseball Bat. You then need to fast travel to the Church and sell both items. When you travel back to the Warehouse, the items will have respawned - you can repeat this unlimited times.
On Level 7, City Hall #2, you get a Diamond from the safe in the Mayor's office. If you go back into the sewers, but then turn round and check the safe again, the Diamond should be spawned back in there again. You can obviously sell the diamonds - so this is a good way to get lots of extra cash.
If you climb on top of a car and sit on the roof, you can kick incoming zombies in the head. It is impossible for them to damage you up here, so be sure to use this technique as a fallback option when the brown stuff hits the fan!
This is easier to have just the weapon you wanna dupe equipped.
OK throw the weapon and as soon as you do go stright to you inventory and drop the equiped weapon. Leave inventory and you will see two of the equipped weapon in front of you! Reapet till you get what you want.
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