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Archery for sure, (recurve). After the initial investment of the bow 100-200$ and say 6 arrows 50$, you don't have to spend any more.
You can practice all you want innawoods, you can hunt with it once you've practiced enough and you feel a bit safer with it by your side.
Furthermore as a time killer innawoods you can learn to make arrows.
Just be sure to find a decent stump or a hill you know you won't lose your arrows on.