Use the following trick if you want to modify, repair, or create a weapon but are short on money. If the craft table is inside of a store, search the cash register. Occasionally you can find a couple hundred dollars.

When you reach the city of Moresby and have access to the warehouse, there are four weapons located inside, the wrench, baseball bat, hammer, and knife. Selling those four items at the church will generate approximately between $400 to $2,000 per trip. Repeat the process as many times as desired.