1. Click on Druggie in the main town.
2. Click the Use tab on Druggie's Shop.
3. Buy Halloween Candy.
4. Enter 1 for amount.
5. Click the Use tab on your inventory.
6. Click OK.
Viola! Now you have NaN mesos.
Bullet Farmer Guide
1. Buy as many Bullets as you can.
2. Sell them.
Viola! Each bullet is around 10000 if sold I think, I'm not entirely sure.